noun

• (colloquial) Second, ¹⁄₆₀ of a minute.
• (colloquial) Clipping of second (“short indeterminate period of time”). [Something that is number two in a series.]
• (colloquial, politics) Clipping of secretary. [(obsolete) Someone entrusted with a secret; a confidant.]
• (US, government, finance) Initialism of Securities and Exchange Commission.
• (US, college, sports) Abbreviation of Southeastern Conference, a college athletics conference