O, o ( O's, o's plural )
1 n-var O is the fifteenth letter of the English alphabet.
2 num O is used to mean zero, for example when you are telling someone a telephone number, or mentioning a year such as 1908.
3 exclam O is used in exclamations, especially when you are expressing strong feelings.
LITERARY, feelings O how mistaken you are!..., O God, I want to go home.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"