sec

Short definition from Wiktionary

Noun

1. 1
   Second, ¹⁄₆₀ of a minute.
2. 2
   Clipping of second (“short indeterminate period of time”).
3. 3
   Clipping of secretary
4. 4
   Initialism of scavenger endothelial cell.

Proper noun

1. 1
   Initialism of Securities and Exchange Commission.
2. 2
   Abbreviation of Southeastern Conference, a college athletics conference
3. 3
   Initialism of State Electricity Commission.

Symbol

1. 1
   Symbol of the trigonometric function secant.