Alternative form of OS / (calendar systems) Abbreviation of old style.

Alternative form of S.I.

plural of S corp.

Abbreviation of S corporation.

plural of S corporation

(business, US) A closely held corporation that makes a valid election to be taxed by the federal government.

(dated) Alternative form of SF (science fiction)

Initialism of Smith & Wesson: an American manufacturer of firearms, ammunition and restraints founded in 1852.

A Smith & Wesson firearm.

plural of S&W