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O

 noun
     
Related topics: Numbers, Letters and punctuation
O , o plural O's, o's
1SLA [uncountable and countable] the 15th letter of the English alphabet
2 [uncountable] spokenHMN zero:
My phone number is six o four double two (=60422).
3 [uncountable] a common type of blood
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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