Definition of fiat
- According to the Bible, the world was created by fiat.
- a fiat of conscience
- government by fiat
He runs the company by fiat.
the school principal issued a fiat that caps were not to be worn inside the school, and that was that
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fiat.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: an official order given by someone who has power : an order that must be followed
What made you want to look up fiat? Please tell us where you read or heard it (including the quote, if possible).
Merriam-Webster's New Words Quiz—Fall 2017 Edition!
Can you spell these 10 commonly misspelled words?TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.TAKE THE QUIZ