o noun
plural o's or os or O's or Os /ˈoʊz/ plural o's or os or O's or Os /ˈoʊz/ Learner's definition of O
1
: the 15th letter of the English alphabet英语字母表的第15个字母 [count]
[noncount]
2
[count] : the number zero(数字)零 —
used in speech when referring to numbers用于口语,指数字 3
[count] —
used as a mark at the end of a letter, an e-mail, etc., to represent a hug用于信件、电子邮件的结尾,表拥抱