fiat

fiat — noun

1. a formal order or decision made by someone in power, typically issued without di

1.nounC2
Definition

a formal order or decision made by someone in power, typically issued without discussion or agreement from others

Example

The king's fiat banned all public gatherings in the capital.

Salma disagreed with the CEO's fiat to cut the health benefits.

fiat + to-infinitive clause

Common collocations
  • by fiat
  • by government fiat
  • by royal fiat
  • by judicial fiat
  • rule by fiat
  • presidential fiat
  • issue a fiat
Synonyms
  • decree

    more neutral in tone; a decree is a formal legal order without the arbitrary implication

  • edict

    often refers to a royal or official proclamation; more archaic in modern use

  • mandate

    an authoritative command, often backed by popular vote or official authorization

  • dictate

    a rule or principle imposed by force; can refer to conscience (e.g., dictates of reason) as well as authority

Antonyms
  • consensus

    general agreement reached through discussion, the opposite of a unilateral order

  • democracy

    a system where decisions are made collectively, not by a single authority

Grammar Patterns

fiat + to-infinitive

by [possessor] fiat

Usage Note

Frequently used in political or legal contexts, often with a critical tone that suggests the decision was arbitrary or bypassed normal procedures. The phrase 'by fiat' (or 'by [authority] fiat') is especially common and functions as an adverbial.

Common Mistakes

The judge issued a fiat finding him guilty.
The judge issued a ruling finding him guilty.
A court's standard decision is a 'ruling'; 'fiat' implies bypassing proper process, so it does not fit ordinary legal judgments.

Synonym discussion

Sense: noun/1

All four words describe authoritative commands, but they differ in connotation and typical context. 'Decree' is the most neutral and legally grounded — a court issues a decree, and no one questions its legitimacy. 'Edict' carries an older, often royal flavour (a king's edict) and is rarely used in modern legal writing. 'Mandate' suggests democratic or institutional backing (an election mandate; a UN mandate) and feels less arbitrary than 'fiat.' 'Dictate' can be personal (the dictates of conscience) or imposed (the dictator's dictates) but lacks the official/legal framing that 'fiat' has. For example, a government might rule by 'decree' during an emergency (neutral, procedural), but critics would call the same action rule by 'fiat' to highlight its lack of consultation.

decreeedictmandate ↗dictate ↗

Common collocations

Nouns

Phrases

  • by fiat
  • by government fiat
  • rule by fiat
  • through fiat

Prepositions

Etymology

LatinEnglish

Borrowed directly from Latin, where 'fiat' is the third-person singular present subjunctive of 'fieri' meaning 'to be done' or 'to become.' The literal translation is 'let it be done.' This formula was used in official legal documents to signal approval, and from that context the word came to mean an authoritative order or sanction.