fi·at

[fee-aht, -at; fahy-uht, -at]
noun
1.
an authoritative decree, sanction, or order: a royal fiat. authorization, directive, ruling, mandate, diktat, ukase.
2.
a fixed form of words containing the word fiat, by which a person in authority gives sanction, or authorization.
3.
an arbitrary decree or pronouncement, especially by a person or group of persons having absolute authority to enforce it: The king ruled by fiat.

Origin:
1625–35; < Latin: let it be done, 3rd singular present subjunctive of fierī to become

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
fiat (ˈfaɪət, -æt) [Click for IPA pronunciation guide]
 
n
1.  official sanction; authoritative permission
2.  an arbitrary order or decree
3.  literary chiefly any command, decision, or act of will that brings something about
 
[C17: from Latin, literally: let it be done, from fierī to become]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Fiat is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

fiat
late 14c., from fiat lux "let there be light" in the Book of Genesis, from L. fiat "let it be done" (also used in the opening of M.L. proclamations and commands), third person singular present subjunctive of fieri, used as passive of facere "to make, do" (see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
FIAT
Italian Fabbrica Italiana Automobili Torino (Italian Automobile Factory of Turin)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
All of this flies in the face of nature and could only be emplaced by fiat.
Every major economy in the world now uses fiat currency which are bits of colored paper.
The total debt and interest owing on it is less than the total of both fiat and debt money available in the world.
The vast influx of gold and silver was no different than the inflation of a
  fiat currency.
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