menage

‖n. [ See Menagerie. ] 1. A collection of animals; a menagerie. [ Obs. ] Addison. [ 1913 Webster ]

2. A social group living together; a household.
Syn. -- family, household, house. [ WordNet 1.5 ]

3. A menage a trois. [ PJC ]

‖n. [ F., household for three ] 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. [ PJC ]

2. A single sexual encounter in which three people participate. [ PJC ]

3. [ figurative ] An unlikely situation in which a group of three people not normally associated with each other participate in an activity together. [ PJC ]

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 (http://classic.mountainzone.com/ski/worldcup/99/worldchamps/superg-m.html) [ PJC ]