/əʊ ||; o/noun [C,U] (
plural O's;o's /əʊz
||; oz/)
1 the fifteenth letter of the English alphabet 英语字母表的第十五个字母: ‘Orange’ begins with (an) ‘O’. orange以字母O开头。
2 (used when you are speaking) zero （用于口语）零: My number is five O nine double four(= 50944). 我的号码是五零九四四。 ☞Look at the note at zero. 参看zero的注释。