of, for, or involving only two people; one-on-one.

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Definition of of, for, or involving only two people; one-on-one. in English English dictionary

Of, for, or involving only two people; one-on-one.
à deux

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.