in (adv., prep.)

中古英语 in (prep.)"in, into, upon, on, at, among; about, during;"和古英语 inne (adv.)"internal, inside"合并而成,来自于古日耳曼语 *in (也是古弗里斯兰语、荷兰语、德语、哥特语 in 、古诺尔斯语 i 的来源),来自于PIE词根 *en "in"。较简单的形式在中古英语中就有了这两种意义。

inon 之间的意义区分来自于后来的中原英语,而 inat 在使用上的细微差别仍然区分着英国和美国英语 ( in school / at school )。有时在中古英语中简称为 i

名词意义上的"影响、访问(权力或权威)",如 have an in with ,最早记录于1929年的美国英语。to be in for it "一定会遇到不愉快的事情"是1690年代的。To be in with "与之友好相处"来自1670年代。 Ins and outs "错综复杂的行动或过程"来自1660年代。 In-and-out (n.) "交媾"被证明来自1610年代。

in (adj.)

"that is within,internal",1590年代,出自 in (副词)。"掌权"的意义( the in party )最早记载于17世纪;"专一"的意义( the in-crowd, an in-joke )来自1907年( in-group );"时尚、时髦"的意义( the in thing )来自1960年。

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Definitions of in from WordNet
in (adj.)
directed or bound inward;
took the in bus
the in basket
in (adj.)
holding office;
the in party
in (adj.)
currently fashionable;
large shoulder pads are in
in (n.)
a unit of length equal to one twelfth of a foot;
Synonyms: inch
in (n.)
a state in midwestern United States;
Synonyms: Indiana / Hoosier State / Ind.
in (adv.)
to or toward the inside of;
come in
smash in the door
Synonyms: inwards / inward
In (n.)
a rare soft silvery metallic element; occurs in small quantities in sphalerite;
Synonyms: indium / atomic number "