Etymology
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topless (adj.)

of women, "bare-breasted," 1966, from top (n.1) + -less. Earlier it was used of men's bathing suits (1937) and women's (1964). Earliest sense is "without a visible summit; immeasurably high" (1580s).

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Definitions of topless

topless (adj.)
having no top;
a topless jar
topless (adj.)
having the breasts uncovered or featuring such nudity;
topless waitresses
a topless cabaret
Synonyms: bare-breasted / braless
From wordnet.princeton.edu