1
: the 18th letter of the Greek alphabet see Alphabet Table
3
slang
: a person who is coolly self-assured, independent, and driven
Unlike alpha males and females who thrive on social dominance, sigmas prefer solitude and operate outside of traditional social hierarchies.—
Gayathri Kallukaran
—often used before another nouna sigma male/female
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Merriam-Webster unabridged
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