sigma

play
noun sig·ma \ˈsig-mə\

Definition of sigma

  1. 1 :  the 18th letter of the Greek alphabet — see alphabet table

  2. 2 :  standard deviation

Origin and Etymology of sigma

Greek


First Known Use: 1584


SIGMA Defined for English Language Learners

sigma

play
noun sig·ma \ˈsig-mə\

Definition of sigma for English Language Learners

  • : the 18th letter of the Greek alphabet


Seen and Heard

What made you want to look up sigma? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a harsh rebuke

Get Word of the Day daily email!