Definition of ménage à trois
1
: an arrangement in which three people (such as a married couple and a lover of one member of the couple) have a sexual or romantic relationship especially while they are living together
2
: a sexual encounter involving three people : threesome
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Merriam-Webster unabridged
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Time Traveler for ménage à trois
The first known use of ménage à trois was in 1856
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