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Definition of omicron

omicron

/ˈɑː.mɪ.krɑːn/
om · i · cron
Plural:omicrons
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omicron Lexical Profile

omicron Game Scores & Validity

• noun

1

The fifteenth letter of the Greek alphabet (Η, ο), transliterated in the Roman alphabet as 'o'.

Example

"In ancient Greek numerals, the letter omicron was used to represent the number seventy."

2

The fifteenth item in a series or system of classification, such as the fifteenth brightest star in a constellation or a designated viral variant.

Example

"Public health officials closely monitored the spread of the omicron variant during the winter months."

• Nearby Words

omen
omeprazole
omerta
omicron
ominous
ominously
ominousness

Word Origin & Etymology

Borrowed from Medieval Greek omikron, literally meaning "small o" (from o and mikron, the neuter form of mikros meaning "small"), coined to distinguish the short vowel letter from omega ("great o").

Cite this Entry

Wordmom. (2026). Definition of Omicron. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/omicron
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