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the number 1 一 -
used in formal language or for emphasis before hundred, thousand, etc., or before a unit of measurement （正式用语或表示强调，用在 hundred、thousand 等或度量单位之前）一 -
used for emphasis to mean ‘a single’ or ‘just one’ （表示强调）单独一个，仅仅一个 Homophones one | wonone won- one number
There can only be one winner. 赢家只能有一个。
- one pronoun
Which do you prefer? The flowery one or the stripy one? 你更喜欢哪个？花的还是条纹的？
- won verb (past tense, past participle of win)
He's just won his 19th singles title. 他刚刚赢得了他的第19个单打冠军。
- one number
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a person or thing, especially when they are part of a group （尤指一组中的）一个人，一件事物 -
used for emphasis to mean ‘the only one’ or ‘the most important one’ （表示强调）唯一的一个，最重要的一个 -
used when you are talking about a time in the past or the future, without actually saying which one （用于一般地谈论过去或将来的某个时间） -
the same 同一个 - (informal, especially North American English)
used for emphasis instead of a or an （代替 a 或 an，表示强调） - (formal or old-fashioned)
used with a person’s name to show that the speaker does not know the person （与人名连用，表示说话人不认识的人）某一个
Word OriginOld English ān, of Germanic origin; related to Dutch een and German ein, from an Indo-European root shared by Latin unus. The initial w sound developed before the 15th cent. and was occasionally represented in the spelling; it was not accepted into standard English until the late 17th cent.
Idioms
as one
- (formal)
in agreement; all together 一致；一齐
(be) at one (with somebody/something)
- (formal)
to feel that you completely agree with somebody/something, or that you are part of something 完全一致；是…的一部分 a place where you can feel at one with nature 一个能让你感到与大自然融为一体的地方
back to square one
be in a minority of one
- (often humorous)
to be the only person to have a particular opinion or to vote a particular way 是唯一持不同意见者；是唯一投此票者
for one
get something in one
to understand or guess something immediately 立即明白（或猜到） ‘Oh, so she’s his sister!’ ‘Got it in one!’ “哦，原来她是他的妹妹，”。“一口气搞定了，”。
get one over (on) somebody/something
go one better (than somebody/something)
to do something better than somebody else or than you have done before 胜人一筹；（比自己过去）做得更好
(all) in one
used to say that somebody/something has different roles, contains different things or is used for different purposes 集于一身（或一体）；多功能；多用途 She's a mother and company director in one. 她既是母亲又是公司董事。 It's a public relations office, a press office and a private office all in one. 那儿既是公关办公室，也是新闻办公室，又是私人办公室：三合一。
one after another/the other
one and all
one and only
used to emphasize that somebody is famous 绝无仅有的；唯一的；有名的 Here she is, the one and only Rihanna! 她来了，唯一的蕾哈娜！
one and the same
one by one
one or two
one up (on somebody)
having an advantage over somebody 略胜一筹；强过（某人）
when you’ve seen, heard, etc. one, you’ve seen, heard, etc. them all
the year one (North American English)
(British English the year dot)
- (informal)
a very long time ago 很久以前 I've been going there every summer since the year one. 从第一年开始，我每年夏天都去那里。