à deux. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/a-deux
Of, for, or involving only two people; one-on-one.
"It is arguable that Litvinov, had he met with civility and those supple conversations à deux in which trained diplomats excel, might have stopped the war..." --William Manchester, The Last Lion Vol. 2, page 458