Definitions
1.InterjectionExpression of surprise."Oh! I didn't see you there."
2.InterjectionExpression of wonder, amazement, or awe."Oh, wow! That's amazing."
3.InterjectionExpression of understanding, affirmation, recognition, or realization."Oh, so that's how it works."
4.InterjectionA word to precede an annoyed remark."Oh, leave me alone."
5.InterjectionA word to precede an added or offhand comment or afterthought."Oh, and don't forget your coat.; What if he says, "Oh, I need to see your ID"?"
6.InterjectionAn invocation or address (similar to the vocative in languages with noun declension), often with a term of endearment."Oh, gosh."
7.InterjectionExclamation for drama or emphasis."Oh, when will it end?"
8.InterjectionExpression of pain. See ouch."Oh! That hurt."
9.InterjectionSpace filler or extra syllable, especially in (popular) music.
10.InterjectionExpression of mild scepticism.""You should watch where you're going!" "Oh?""
11.NounAn utterance of oh; a spoken expression of surprise, acknowledgement, etc.
12.VerbTo utter the interjection oh; to express surprise, etc.
13.NounThe name of the Latin script letter O/o.
14.NounThe digit 0 (especially in representations of speech)