Define: Sigma

UK Accounting Glossary

Definition: Sigma

Quick Summary of Sigma

In mathematics, the Greek symbol sigma represents a summation operator.

What is the dictionary definition of Sigma?

Dictionary Definition

  1. The eighteenth letter of the Classical and Modern Greek, the twentieth letter of Old and Ancient.
  2. mathematics The symbol Σ, used to indicate summation of a set or series.
  3. statistics The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.


Cite Term

To help you cite our definitions in your bibliography, here is the proper citation layout for the three major formatting styles, with all of the relevant information filled in.

Page URL
Modern Language Association (MLA):
Sigma. Payroll & Accounting Heaven Ltd. April 04, 2020
Chicago Manual of Style (CMS):
Sigma. Payroll & Accounting Heaven Ltd. (accessed: April 04, 2020).
American Psychological Association (APA):
Sigma. Retrieved April 04, 2020, from website:

Definition Sources

Definitions for Sigma are sourced/syndicated and enhanced from:

  • A Dictionary of Economics (Oxford Quick Reference)
  • Oxford Dictionary Of Accounting
  • Oxford Dictionary Of Business & Management

This glossary post was last updated: 6th January 2020.