1. The fifteenth letter of the Greek alphabet, represented by the symbol ο or Ο.
Usage: Also spelled 'omicron'; 'omikron' is a variant transliteration from Greek.
2. A variant of the SARS-CoV-2 virus that causes COVID-19, first identified in South Africa in 2021.
Usage: Capitalized when referring to the specific COVID-19 variant; commonly used in medical and public health contexts.

Examples

• The Greek letter omikron comes after nu in the alphabet.
• In mathematics, omikron is sometimes used to represent small quantities.
• The Omikron variant spread rapidly across the globe in late 2021.
• Health officials warned about the new Omikron subvariants.
• Students learning Greek must memorize the pronunciation of omikron.