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adieu

[ uh-doo, uh-dyoo; French a-dyœ ]
/ əˈdu, əˈdyu; French aˈdyœ /
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interjection

goodbye; farewell.

noun, plural a·dieus, a·dieux [uh-dooz, uh-dyooz; French a-dyœ]. /əˈduz, əˈdyuz; French aˈdyœ/.

the act of leaving or departing; farewell.

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Origin of adieu

First recorded in 1325–75; Middle English, from Middle French, equivalent to a (from Latin ad “to”) + dieu (from Latin deus “god”)
à deux, adieu , ado
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for adieu

adieu
/ (əˈdjuː, French adjø) /

sentence substitute, noun plural adieus or adieux (əˈdjuːz, French adjø)

goodbye; farewell
C14: from Old French, from a to + dieu God
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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