• prep. 按照（表示方式）；从事于；在…之内
• adv. 进入；当选；（服装等）时髦；在屋里
• adj. 在里面的；时髦的
• n. 执政者；门路；知情者
• n. (In)人名；(中)演(广东话·威妥玛)；(柬)殷(用于名字第一节)， 因；(日)寅 (名)

来自古英语in,里面，上面，中间，进入，来自PIE*en,进入。词义上面已由on替代。

in

in: [OE] In is a widespread preposition amongst the Indo-European languages. Greek had en, Latin in (whence French and Italian en and Spanish in), and amongst modern languages German and Dutch have in, Swedish i, Welsh yn, and Russian v, all of which point back to an original Indo-European *en or *n. The adverb in was not originally the same word; it comes from a conflation of two Old English adverbs, inn and inne, both ultimately related to the preposition in. (An inn is etymologically a place ‘in’ which people live or stay.)
=> inn

in

Old English in (prep.) "in, into, upon, on, at, among; about, during;" inne (adv.) "within, inside," from Proto-Germanic *in (cognates: Old Frisian, Dutch, German, Gothic in, Old Norse i), from PIE *en "in" (cognates: Greek en, Latin in "in, into," Old Irish in, Welsh yn-, Old Church Slavonic on-). As an adjective from 1590s.

The forms merged in Middle English. Modern sense distinction between in and on is from later Middle English. Sense of "holding power" (the in party) first recorded c. 1600; that of "exclusive" (the in-crowd, an in-joke) is from 1907 (in-group); that of "stylish, fashionable" (the in thing) is from 1960. The noun sense of "influence, access" (have an in with) first recorded 1929 in American English. In-and-out "copulation" is attested from 1610s.

1. No matter where you go in life or how old you get, there's always something new to learn about. After all, life is full of surprises.

不管你生活在哪里，你有多少岁，总有新东西要学习，毕竟，生活总是充满惊喜。

来自金山词霸 每日一句

2. For what do we live, but to make sport for our neighbours, and laugh at them in our turn?

我们活着是为了什么？不就是给邻居当笑柄，再反过来笑他们。

来自《傲慢与偏见》

3. If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre

如果你独处时感到寂寞，说明没有把自己陪好。

来自金山词霸 每日一句

4. The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.

当你从内心深处找到一种可以忍受一切痛苦的坚强力量时，你的成长历程就会出现飞跃。

来自金山词霸 每日一句

5. They have maintained their optimism in the face of desolating subjugation.

面对遭征服的悲惨命运，他们保持了乐观的态度。

来自柯林斯例句