1802, "of one sex, having only one sex," from uni- + sexual. Meaning "of or for a single sex" (of schools, etc.) is from 1885. Meaning "unisex" is from 1970. Related: Unisexual.
unionize
unipersonal
unipolar
unique
unisex
unisexual
unison
unit
unitard
unitarian
unitarianism
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