01 n. A relationship involving three people, especially one in which three people live together and have sexual relations, such as a married coup…
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1.
A relationship involving three people, especially one in which three people live together and have sexual relations, such as a married couple and a lover of one of the pair.
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A single sexual encounter in which three people participate.
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3.
An unlikely situation in which a group of three people not normally associated with each other participate in an activity together.[figurative]“For the first time in World Championships history, two racers shared the first-place gold medal. Maier and Kjus arm-in-arm on the podium, with Austrian Hans Knauss just .01 seconds back from making it a menage-a-trois.” — Andrew Hood, in (http://classic.mountainzone.com/ski/worldcup/99/worldchamps/superg-m.html)