Etymology
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denim (n.)

1690s, from French serge de Nîmes "serge from Nîmes," town in southern France. Originally a kind of serge; application to "coarse, colored, twilled cotton cloth" is by 1850 in American English. Denims "pants made of denim" is recorded from 1868; originally typically overalls. The place name is Roman Nemausus, said to be ultimately from Gaulish nemo "sanctuary."

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Definitions of denim

denim (n.)
(used in the plural) close-fitting trousers of heavy denim for manual work or casual wear;
Synonyms: jeans / blue jeans
denim (n.)
a coarse durable twill-weave cotton fabric;
Synonyms: dungaree / jean
From wordnet.princeton.edu