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O

Definition: 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.

O

Definition: The letter O, or its sound.

O

Definition: Something shaped like the letter O; a circle or oval.

O

Definition: A cipher; zero.

O

Definition: One.

O

Definition: 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.