sigma

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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

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a dividing ridge between drainage areas

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