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.
(n.) The letter O, or its sound.
(n.) Something shaped like the letter O; a circle or oval.
(n.) A cipher; zero.
(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.
