Etymology
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sixty-nine (adj., n.)

"1 more than sixty-eight; the number which is one more than sixty-eight; a symbol representing this number;" see sixty + nine. In the sexual sense, 1888, as a translation of French faire soixante neuf, literally "to do 69." So called from the similarity of positions to the arrangement of the numerals.

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Definitions of sixty-nine
1
sixty-nine (n.)
oral sex practiced simultaneously by two people;
Synonyms: soixante-neuf
2
sixty-nine (adj.)
being nine more than sixty;
Synonyms: " / ilxx
From wordnet.princeton.edu

Dictionary entries near sixty-nine

sixth

sixties

sixtieth

sixty

sixtyfold

sixty-nine

sizar

size

sizeable

sizer

sizzle