à deux (ä? d??)adj. Of or involving two individuals, especially when of a private or intimate nature.adv. Privately with only two individuals involved: dining à deux.[French : à, by, at + deux, two.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.à deux (a dø) adj, advof or for two personsCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014à deux (? ?d?; Fr. a ?d?) adj., adv. with just two persons present: dinner à deux.[