Definition of O

  • () Among the ancients, O was a mark of triple time, from the notion that the ternary, or number 3, is the most perfect of numbers, and properly expressed by a circle, the most perfect figure.
  • (a.) One.
  • (interj.) An exclamation used in calling or directly addressing a person or personified object; also, as an emotional or impassioned exclamation expressing pain, grief, surprise, desire, fear, etc.
  • (n.) The letter O, or its sound.
  • (n.) Something shaped like the letter O; a circle or oval.
  • (n.) A cipher; zero.

Antonyms of O


No Antonyms Found.

Homophones of O





Common English words

A list of the most frequently used words in the English languge.

Longest English Words

Longest words in the Oxford Dictionary.