[ah dœ; French a dœ]
being between two persons in intimate relationship: dinner à deux.
intimately with just two persons present: dined by candlelight à deux.
Origin of à deux
< French: of or for two; two at a time
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
of or for two persons
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
French, à deux, literally "for two" (see deuce).
Online Etymology Dictionary, © 2010 Douglas Harper