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affidavit

[af-i-dey-vit]
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noun Law.
  1. a written declaration upon oath made before an authorized official.
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Origin of affidavit

1615–25; < Medieval Latin affīdāvit (he) has declared on oath, perfect 3rd singular of affīdāre; see affiance
Related formspre·af·fi·da·vit, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for affidavit

affidavit

noun
  1. law a declaration in writing made upon oath before a person authorized to administer oaths, esp for use as evidence in court
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Word Origin

C17: from Medieval Latin, literally: he declares on oath, from affīdare to trust (oneself) to; see affiance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for affidavit

n.

1590s, from Medieval Latin affidavit, literally "he has stated on oath," third person singular perfective of affidare "to trust," from Latin ad- "to" (see ad-) + fidare "to trust," from fidus "faithful," from fides "faith" (see faith). So called from being the first word of sworn statements.

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Online Etymology Dictionary, © 2010 Douglas Harper