15 Latin Words and Phrases Still Hiding in Legal English
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The law still speaks Latin. Here are 15 Latin words and phrases used in everyday legal English — pro se, prima facie, amicus curiae — clearly explained.
Walk into any courtroom and you are hearing Latin. English law grew up alongside Latin and never fully let go, so the profession still runs on phrases that are centuries old.
Here are 15 Latin words and phrases you will meet in legal English, each in plain terms. Knowing them makes contracts, news stories, and courtroom dramas far easier to follow.
Why does the law still use Latin?
For centuries Latin was the shared written language of European scholarship and administration, including the courts. Legal phrases became fixed technical terms — precise, compact, and understood the same way everywhere — so the profession kept them even as everyday Latin faded.
Precision is the reason they survive. Prima facie ('at first appearance') and amicus curiae ('friend of the court') each carry an exact legal meaning that would take a full sentence to spell out in English. The words below are the ones you are most likely to actually encounter.
15 Latin terms in legal English
1. pro se
“Representing oneself in court without the assistance of a lawyer” — From Latin pro (“for”) + se (“oneself”), meaning “for oneself”.
2. prima facie
“Based on the first impression; accepted as correct until proven otherwise” — From Latin prīmā faciē “at first appearance”, ablative of prīmus + faciēs.
3. amicus curiae
“A person or group who is not a party to a lawsuit but has a strong interest in the matter and offers information to assist the court” — From New Latin amīcus cūriae, literally ‘friend of the court’ circa early 1600s.
4. ultra vires
“Actions taken by a corporation or individual that are beyond their legal power or authority” — From Latin ultra ‘beyond’ + vires ‘powers, strength’ (genitive of vis).
5. affidavit
“A written statement made under oath” — Borrowed from Medieval Latin affīdāvit meaning 'he/she has made a pledge,' third person singular perfect indicative active of affīdāre.
6. tort
“A wrongful act or an infringement of a right leading to legal liability” — From Middle English 'injury', ultimately from Latin tortus meaning 'twisted' (from torquēre).
7. usufruct
“The right to use and enjoy another's property” — From Latin ususfructus, from usus ('use') and fructus ('enjoyment').
8. guardian ad litem
“A person appointed by the court to represent the best interests of a child or incapacitated person during legal proceedings” — From Latin guardian-us + ad lītem, meaning "for the lawsuit".
9. fiduciary
“Relating to the responsibility of a trustee or agent” — From Latin fīdūciārius (from fīdūcia, from fīdere) meaning 'trust' with suffixes.
10. chattel
“Personal property that is movable, as opposed to real estate” — From Middle English chatel ('movable possession'), via Anglo-French chatel and Medieval Latin capitāle ('movable property').
11. edict
“An order, decree” — From Middle English and Latin: edictum, neuter of edictus, from edicere ('to decree').
12. jurat
“A certification on an affidavit showing when and where it was sworn” — Short for Latin juratum (est) meaning 'it has been sworn', a 3rd singular perfect passive form of jurare ('to swear').
13. plenary
“Complete in every way” — Borrowed from Late Latin plēnārius (via Middle English), from Latin plēnus 'full' with the suffix -ārius.
14. contempt
“Willful disobedience or disregard of a court's authority” — Borrowed from Middle English and Anglo-French from Latin contemptus, from contemnere meaning 'to look down on, show no respect for, despise' with the suffix -tus.
15. domiciled
“To establish a residence or home” — Middle English, from Middle French, from Latin domicilium, from domus.
Frequently asked questions
Why is legal English full of Latin?
Because Latin was the language of scholarship and the courts for centuries. Its phrases became precise, fixed technical terms, so the profession kept them even after everyday Latin disappeared.
What does 'pro se' mean?
Pro se is Latin for 'for oneself'. Someone who appears pro se is representing themselves in court without a lawyer.
What does 'prima facie' mean?
It means 'at first appearance'. A prima facie case is one that looks valid on its face — strong enough to proceed unless disproved by other evidence.
Is knowing legal Latin actually useful?
Yes. These phrases turn up in the news, contracts, and everyday reading, not just in court. Recognising a handful of them makes a lot of formal writing much easier to understand.
