from The American Heritage® Dictionary of the English Language, 4th Edition
- interj. Used to express strong emotion, such as surprise, fear, anger, or pain.
- interj. Used in direct address: Oh, sir! You forgot your keys.
- interj. Used to indicate understanding or acknowledgment of a statement.
- n. Zero.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- interj. Expression of surprise.
- interj. Expression of wonder, amazement, or awe.
- interj. Expression of understanding, recognition, or realization.
- interj. A word to precede an offhand or annoyed remark.
- interj. A word to precede an added or comment or afterthought.
- interj. An invocation or address (similar to the vocative in languages with noun declension).
- interj. Exclamation for drama or emphasis (often poetic).
- interj. Expression of pain. See ouch.
- interj. Space filler or extra syllable, especially in (popular) music.
- interj. Used with a term of endearment.
- interj. Expression of mild scepticism
- n. the letter O, o (more commonly spelled o)
- n. the digit 0 (especially in representations of speech)
- n. An utterance of oh; a spoken expression of surprise, acknowledgement, etc.
- v. To utter the interjection oh; to express surprise, etc.
from the GNU version of the Collaborative International Dictionary of English
- interj. An exclamation expressing various emotions, according to the tone and manner, especially surprise, pain, sorrow, anxiety, or a wish. See the Note under o.
from The Century Dictionary and Cyclopedia
- See O.
- An abbreviation of Old High German.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a midwestern state in north central United States in the Great Lakes region
From the number zero's resemblance to the letter O.(American Heritage® Dictionary of the English Language, Fourth Edition)