oh

I. interjection also O Etymology: Middle English o Date: 13th century 1. — used to express an emotion (as surprise or desire) or in response to physical stimuli 2. — used in direct address <

oh, waiter! Will you come here, please?

> 3. — used to express acknowledgment or understanding of a statement 4. — used to introduce an example or approximation II. noun Etymology: o; from the similarity of the symbol for zero (0) to the letter O Date: 1936 zero