Definitions

1. noun

A letter in the 24th and last letter of the Greek alphabet.

“The researcher used the Greek letter sigma in the mathematical model to represent the standard deviation.”

2. noun

A symbol used to represent the standard deviation in statistics and mathematics.

“The professor explained that the sigma symbol in the equation denoted the standard deviation of the data set.”

3. noun

A type of galaxy characterized by a large central bulge and a disk of stars, gas, and dust.

“Astronomers discovered a new sigma galaxy in a distant region of the universe.”

4. noun

In psychology, a personality trait characterized by confidence, charisma, and leadership abilities.

“The psychologist studied the sigma male personality and its relationship to social status and dominance.”

5. adjective

In mathematics and statistics, representing the standard deviation or deviation from the mean.

“The data was analyzed using the sigma method to determine the standard deviation of the results.”