o — Definition & Meaning

1. 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. Source: opted

2. n. The letter O, or its sound. Source: opted

3. n. Something shaped like the letter O; a circle or oval. Source: opted

4. n. A cipher; zero. Source: opted

5. a. One. Source: opted

6. 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. Source: opted

7. n. a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust Source: wordnet

8. n. the 15th letter of the Roman alphabet Source: wordnet

9. n. the blood group whose red cells carry neither the A nor B antigens Source: wordnet

10. A prefix to Irish family names, which signifies grandson ordescendant of, and is a character of dignity; as, O'Neil, O'Carrol. Source: adambom

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