1969, American English, shortening of liberation, used with possessives, originally in Women's Lib. Colloquial shortening libber for liberationist (n.) is attested from 1971.

also ad lib., 1811 as a musical instruction, shortened from Latin ad libitum "to (one's) pleasure, as much as one likes" (c. 1600), from ad "to" (see ad-) + libitum "pleasure," accusative of libere "to please" (see libido). As a noun from 1825; as a verb by 1915.

1906, diminutive euphemistic abbreviation for women's underwear (or undergarments).

also Y.W.C.A., 1874, initialism (acronym) of Young Women's Christian Association.

1943, American English, acronym from Women's Army Corps, formed 1943.

"without a back," 1919, in reference to women's gowns and dresses, earlier of benches, from back (n.) + -less.

thin material used for women's dresses, 1882, from French voile "veil" (see veil (n.)).

"women's close-fitting strapless top," 1979, from French bustier, from buste "bust" (see bust (n.1)).

"bar clip for women's hair," 1901, from French barrette, diminutive of barre "bar" (see bar (n.1)).

colloquial abbreviation of midshipman, by 1818. As "loose, long type of women's blouse," 1911, from resemblance to shirts worn by midshipmen.