Vocabulary
Glossary
Every term as it actually came up, with the sentence it came up in. The context is the point — a word is easier to keep when you can see where you met it.
Dictionary
English words — legal and ordinary — explained plainly for a reader whose first language is not English. Latin and foreign phrases have their own section below.
AC / WLR
allurement
anecdotal
appellate
averments
binding / persuasive
category of illusory reference
codify
common humanity
conclusive
concur
core and penumbra
declaratory theory
delict
depart
discover / invent
Discuss
dissent
distinguishing
edn
evidence
floodgates
formalism
glance
hierarchy (of courts)
HL
idiom / idiomatic
implicit
implied licence
invitee / licensee / trespasser
judgment
judgment (spelling)
leeway of choice
legal fiction
level of generality
Lord Chancellor
Lords of Appeal in Ordinary
material facts
open texture
overruling
practice (of a court)
Practice Statement 1966
precedent
relevancy
retrospective
rule of law / rule of practice
rule-scepticism
sentiment
sovereignty (of Parliament)
speech
term of art
the flip
the manufacturer's rule (Donoghue, Atkin)
the merits
though / tough
treat
unqualified
verification
vexed (question)
wonder / wander
61 terms.
Terms of Art
Updated after every session. Last revised 17 September 2026.
Let me be clear about what a term of art is, because the phrase is itself one. A term of art is a word that carries a fixed technical meaning inside a field — here, the law — that is different from, and usually narrower than, its meaning in ordinary English. Material does not mean physical. Distinguish does not mean tell apart. Practice does not mean rehearsal. The dangerous ones are the ones that look ordinary, because the ordinary sense is always available to you, always plausible, and always wrong.
Here is why this matters in a self-help system. Terms of art are the great powers of the vocabulary. Each one carries a capability that ordinary words do not: when you say obiter, you are not describing a remark, you are stripping it of authority. When you say material, you are not describing a fact, you are asserting that the decision turns on it. Deploy the term correctly and the other side must either accept the consequence or contest the classification. Deploy it in its ordinary sense and you have handed the other side a free attack — a self-inflicted loss, with nobody to blame.
So every entry below has four parts. What the term means in law. The trap — the ordinary sense that will get you killed. How to deploy it: offensively, to force the other side onto the technical ground, and defensively, to hold your own. And where it came up on your record, because a term you have already misused is a term you know the shape of.
ratio decidendi
The rule of law on which the decision was founded, treated as necessary to the result on the material facts. The only part of a judgment that binds.
Ordinary sense: "the reasoning". The ratio is not the reasons the judge gave; a judge can give bad reasons for a right decision.
Offensively: when the other side quotes a passage, ask whether the decision needed it. If not, it is obiter and it binds nobody. Defensively: state your ratio in Goodhart's form — material fact plus decision — and name the rung you are stating it at, so nobody can move it on you.
You said "public sentiment" was a third ratio in August. On Goodhart's method it fails at the first move: no material fact grounds it.
obiter dictum
A thing said by the way: not necessary to the decision. Persuasive, never binding.
Ordinary sense: "a side remark", "less important". Obiter can be the most important sentence in the judgment — the neighbour principle is obiter — and still bind nobody.
Offensively: the classification strips authority; use it when the other side leans on a passage the decision did not need. Defensively: never say "abused" of an obiter later courts adopted — it assumes the answer. Say "adopted" and argue whether they were free to.
"The neighbour principle was only an obiter … used and abused." 13 Sep.
material (fact)
A fact the judge treated as making a difference to the result. Test by removal: absent that fact, would the decision have had to differ?
Ordinary sense: physical, tangible, important. A material fact is often trivial in itself — an opaque bottle — and a dramatic fact is often immaterial.
Offensively: run the removal test on the other side's stated ratio; a fact they cannot remove without changing the result is one they must defend. Defensively: name your material facts before the hypotheticals arrive, so the clear-glass bottle finds you ready.
You reached "an earlier decision of this House on the same point" only on the fourth putting, 17 Sep. Goodhart's presumption — person, time, place, kind, amount immaterial unless treated otherwise — is the shortcut.
distinguish
To hold that an earlier case does not govern this one because a material fact of the earlier case is absent here. The case stays binding; it is stepped off.
Ordinary sense: to tell two things apart. In law you distinguish a case, not two things, and the earlier case remains good law.
Offensively: when the other side distinguishes, ask which material fact is absent and whether the earlier court treated it as material. A distinction on an immaterial fact is a disguised departure — Lord Reed's "judicial gymnastics". Defensively: it is the cheapest escape from a precedent you cannot overrule; use it before you reach for "wrongly decided".
Your peg analogy, 13 Sep: distinguishing leaves the peg and steps off. Right. Reid's test for the limit: development stops where you would have to say the earlier case was wrongly decided.
overrule
A court with the power to do so declares an earlier decision no longer law. Only a higher court, or the same top court since 1966.
Ordinary sense: to override, to overrule an objection. Lower courts cannot overrule; they distinguish. And overruling a decision is not the same as rejecting its further reasoning — Burrows's point.
Offensively: "Is that overruling, or distinguishing?" forces the other side to say which power they claim. Defensively: Wilberforce and Morris reached Herrington without overruling; Reid said that was impossible. Know which Lord you are standing with.
Five Lords, one result, three accounts of whether Addie was overruled.
depart
The Practice Statement's verb: to leave an earlier decision standing and not follow it. Softer than overrule; the Statement never says overrule.
Ordinary sense: to leave. The softness is deliberate; do not read it as timidity.
Offensively: the Statement's own word is "depart when it appears right" — an open discretion; make the other side supply the criteria, which are not in the text. Defensively: cite Reid's guidelines as the content the judges gave it.
Paper 2; Paterson.
bound / binding
A court is bound when it must follow an earlier decision whether or not it agrees. Binding is the ordinary force of precedent within the hierarchy.
Ordinary sense: tied up, unable to move. A bound court can still distinguish, restate narrowly, or say it disagrees. Bound is not paralysed.
Offensively: ask "bound to what?" — the narrow rule or the wide one — and watch the other side pick a rung. Defensively: answer that question once, in one sentence, and stay there. Five answers is zero answers.
Five answers to one word, 13 Sep.
conclusive
Halsbury's word: the matter is closed and may not even be raised. Stronger than binding.
Ordinary sense: decisive, convincing. In Tramways it is a term for finality, not for persuasiveness.
Offensively: a court that calls its own decisions "conclusive" and then modifies its "practice" has used two vocabularies; make the other side choose which the decision rests on. Defensively: keep the label apart from the fact — the earlier decision was called conclusive; that is Halsbury's characterisation, not a fact about it.
Your Tramways brief; the two-objects distinction of 17 Sep.
practice (of a court)
What a court habitually does about itself — its procedure, its past decisions. Made by the court, alterable by the court.
Ordinary sense: rehearsal, or "practical" meaning useful. You have said "practical rule" three times. It is a rule of practice.
Offensively: if the 1898 rule was practice, the 1966 Statement was an act of the same kind by the same body — the first horn in one move. Defensively: if it was law, say what made it law, since no statute and no higher court imposed it.
"Modify their present practice." 17 Sep, first answer of the evening — right.
precedent
An earlier decision treated as authority for a later one. In England: a single decision of a higher court binds; on the Continent: a settled line persuades.
Ordinary sense: an example, a first occurrence. "Setting a precedent" in ordinary speech is not the doctrine.
Offensively: ask whether the other side means the doctrine (binding single decisions) or the habit (following past cases), because the question "is precedent a myth" has a different answer for each. Defensively: define which you mean in your first sentence.
Goodhart's "series or group of cases creating a practice" is the contrast you need.
authority
A source a court must or may rely on: a binding case, a persuasive case, a statute. "Authority for the proposition that…"
Ordinary sense: power, an official. In an essay, "authority" means the case you cite, and a claim without one is an assertion.
Offensively: "What is your authority for that?" is the shortest question in the room. Defensively: every bold claim is your best-authorised claim, not your only unauthorised one — the 59 mark was for exactly this.
August essay: the boldest claim was the only one without authority.
hold / held
What a court decides as a rule of law. "The House held that…" introduces the ratio.
Ordinary sense: to keep, to grasp. A court does not hold a fact; it treats a fact as material and holds a rule.
Offensively: when the other side says "the court held", ask them to finish the sentence with a rule, not a fact. Defensively: the sentence has a shape — "Where [material fact], the court held [decision]" — use it and it cannot be misread.
"The House held the already decided point of law as a material fact." 17 Sep — the verbs crossed.
relevancy
Scots: whether the claim would succeed if every fact in it were true. A point of law decided on assumed facts.
Ordinary sense: relevance, pertinence. Nothing to do with it.
Offensively: a case decided on relevancy has no found facts — so any material-facts ratio rests on assumed facts, which the other side must admit. Defensively: it is why Donoghue's ratio is a choice between two passages, not a finding.
Your best insight in August: no trial, averments pro veritate.
averment
A fact alleged in the pleadings. Not proved; alleged.
Ordinary sense: none — it looks like "avert" and is unrelated.
Pair it with pro veritate: "the averments were taken pro veritate" says in five words that the whole case ran on assumed facts.
Donoghue.
per incuriam
Decided in ignorance of a binding authority or statute. One of three grounds on which the Court of Appeal may refuse to follow itself.
Ordinary sense: none; but do not use it to mean "wrongly decided". A wrong decision is not per incuriam unless the court missed something binding.
Offensively: it is an exception with a narrow gate; if the other side calls a case per incuriam, ask what binding thing was missed. Defensively: Halsbury's mistake-of-fact exception is its ancestor — and he shut every other door.
Cross & Harris; Young v Bristol Aeroplane.
res integra
An untouched question — never decided, open to be argued from scratch.
Ordinary sense: none. Do not confuse with "integrity".
Halsbury: a decided point is never again res integra. Use it to say, in two words, that a question is closed.
Tramways, second movement.
open texture / core / penumbra
Hart: every rule has a core where it plainly applies and a fringe where its application is a choice. Rules bind in the core; judges choose at the edge.
Ordinary sense: fabric; shadow. And the trap of the sceptic: treating the fringe as if it were the whole.
Offensively: against "bound in theory, free in reality" — the choice at the edge does not dissolve the rule at the core; fourteen departures in forty-three years is a core holding. Defensively: it is the instrument that lets you hold "bound" and "leeway" in one hand. Reach for it.
Named at your second answer on 13 Sep; never used when it was the exact answer twenty minutes later.
leeway of choice
Stone: the range the materials leave open, within which the judge must choose.
Ordinary sense: slack, tolerance. Stone's leeway is not laxity; it is the structural gap between premises and conclusion.
Offensively: every ratio is stated at a rung; the judgment does not fix the rung; the later court chose it. Defensively: Reid found a bottom to the ladder in Herrington — "wrongly decided" — so the leeway is bounded. Say where the bottom is.
Your clear-glass answer: "This is Julius Stone."
declaratory (theory)
The claim that judges find and declare law that already exists; they do not make it. Reid: a fairy tale.
Ordinary sense: stating, announcing. The theory is a claim about the source of law, not about tone.
Offensively: against "Atkin discovered a principle" — a thing discovered was there before; was it, in the cases? Defensively: if you take the declaratory line, own its consequence: the 1898 rule was also "discovered", and then 1966 declared it away.
"Cherry-picking masked as discovery." 13 Sep.
discuss (in a question)
Take a position, argue it, and meet the strongest objection. Not describe both sides.
Ordinary sense: talk about. A "discussion" that surveys is a fail.
The essay instruction is a command to choose. Choose, and pay.
Every question set.
I submit / with respect
"I submit" introduces the advocate's contention, not a fact. "With respect" precedes disagreement with a judge.
Ordinary sense: give in; politeness. In court, "with respect" means "you are wrong".
Offensively: "I submit" marks the sentence you will defend; use it once, on the claim that matters. Defensively: "with respect" lets you contradict Halsbury in an essay without sounding like a student who has not read him.
Not yet used. Use it on the 26th.
21 terms of art.
Latin
Every Latin or foreign phrase that has come up, with its literal meaning, its meaning in law, how it is said and used in a sentence, and where you met it. Updated after every session. Last revised 18 September 2026.
A word on why these get their own page. Latin in English law is not decoration and it is not a test of schooling; it is a set of fixed tokens that lawyers pass to each other because each one carries a whole rule in two or three words. Per incuriam is a sentence. Pro veritate is a paragraph. You do not need to know Latin. You need to know these tokens exactly — what each one means literally, what it means in law, and how it sits in an English sentence — because a mispronounced or misplaced one tells the other side you are holding a weapon you cannot fire.
culpa
Fault, blame
Latin: fault, blameworthiness.
KUL-pa. Atkin: negligence 'or treat it as in other systems as a species of culpa'.
Atkin: liability for negligence "or treat it as in other systems as a species of culpa". — 12 Sep 2026
interest rei publicae ut sit finis litium
It is in the public interest that there be an end to lawsuits
Latin maxim: it is in the public interest that there be an end to lawsuits.
Usually shortened to 'finis litium'. 'Halsbury's ground was finis litium.'
Halsbury's reason for the rule in Tramways. — 13 Sep 2026
jurisprudence constante
French: settled case law
French: settled case law. A consistent line of decisions treated as strong evidence of the law; no single case binds. The Continental alternative to the English rule.
zhoo-ris-proo-DAHNCE kon-STAHNT. 'On the Continent a single case persuades; jurisprudence constante has weight.'
Goodhart 1934; Cross & Harris. — 13 Sep 2026
obiter dictum
A thing said by the way
Anything a judge says that was not necessary to the decision. Not binding — only persuasive. Plural: obiter dicta. Often just "obiter".
OH-bit-er DIK-tum; plural obiter dicta. 'The neighbour principle was obiter.' Often just 'obiter'.
The natural opposite of ratio; you cannot define one without the other. — 16 Aug 2026
per incuriam
Through carelessness
Latin, "through carelessness": a decision reached in ignorance of a binding authority or statute that would have changed the result. One of the three Young v Bristol Aeroplane exceptions.
per in-KYOOR-ee-am. 'The decision was given per incuriam — the court had not been shown the 1957 Act.'
Cross & Harris, ch 1. — 13 Sep 2026
pro veritate
As if true
Latin, "as if true": facts assumed to be true for the purpose of deciding a point of law.
pro veh-rih-TAH-tay. 'The averments were taken pro veritate.'
Donoghue — the snail was never proved; the averments were taken pro veritate. — 6 Sep 2026
ratio decidendi
The reason for deciding
The part of a judgment that is actually binding on later courts — the legal reason the case was decided as it was. Latin: "the reason for deciding". Often shortened to the ratio.
ratio dess-ih-DEN-dye. 'The ratio of Donoghue is the manufacturer's rule.' Often just 'the ratio'.
The whole question set 16 August 2026: "The ratio decidendi of a case is not what the deciding court laid down." — 16 Aug 2026
res integra
An untouched thing
Latin, "an untouched thing": a question no court has yet decided, so it may be argued from scratch. A decided point is never again res integra.
rays in-TEG-ra. 'The point is not res integra — this House decided it in 1894.'
Halsbury in Tramways: impossible to raise the question again "as if it was res integra and could be reargued." — 13 Sep 2026
stare decisis
To stand by things decided
The formal name for the doctrine of precedent. Latin: "to stand by things decided".
STAH-ray deh-SY-sis. 'The English doctrine of stare decisis.' The formal name of the doctrine of precedent.
The underlying principle the 16 August question attacks. — 16 Aug 2026
sub silentio
In silence
Latin, "in silence": a court passes a point without discussing it — or leaves a precedent behind without saying so.
sub sil-EN-tee-oh. 'The House departed from Addie sub silentio.'
Your own answer: the Lords "departed silently" before 1966. — 13 Sep 2026
ultra vires
Beyond the powers
Latin, "beyond the powers": an act the actor had no legal authority to do.
UL-tra VY-reez. 'The Statement was ultra vires the House.' Also of companies and public bodies.
The second horn of the Precedent question — was the 1966 Statement ultra vires? — 13 Sep 2026
11 phrases.