Sec and S

Sec noun - 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites.

S is a synonym for sec. In some cases you can use "S" instead a noun "Sec".

S noun - The 19th letter of the Roman alphabet.

Sec is a synonym for s. You can use "Sec" instead the word "S" as a noun or an adjective.