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[af-i-dey-vit] /ˌæf ɪˈdeɪ vɪt/
noun, Law.
a written declaration upon oath made before an authorized official.
Origin of affidavit
1615-25; < Medieval Latin affīdāvit (he) has declared on oath, perfect 3rd singular of affīdāre; see affiance
Related forms
preaffidavit, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for affidavit


(law) a declaration in writing made upon oath before a person authorized to administer oaths, esp for use as evidence in court
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
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Word Origin and History for affidavit

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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