enceinte (adj.)

"pregnant, with child," c. 1600, insente, from French enceinte "pregnant" (12c.), from Late Latin incincta (source of Italian incinta), explained by Isidore of Seville (7c.) as "ungirt," from Latin in- "not" (see in- (1)), + cincta, fem. of cinctus, past participle of cingere "to gird" (see cinch). But the Late Latin word is more likely from Latin inciens "pregnant," from in- (2) "in, into" + PIE root *keue- "to swell," also "vault, hole." Modern form is 18c., perhaps a reborrowing from French.

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