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sec (n.)

1956, conversational shortening of second (n.).

sec (adj.)

of wine, "dry," French sec (10c.), from Latin siccus "dry" (also source of Italian secco); see siccative.

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Definitions of sec from WordNet
1
sec (n.)
1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites;
Synonyms: second / s
sec (n.)
ratio of the hypotenuse to the adjacent side of a right-angled triangle;
Synonyms: secant
sec (n.)
an independent federal agency that oversees the exchange of securities to protect investors;
Synonyms: Securities and Exchange Commission
2
sec (adj.)
(of champagne) moderately dry;
Synonyms: unsweet
From wordnet.princeton.edu