介词（preposition 简写prep.）又称作前置词，表示名词、代词等与句中其他词的关系，在句中不能单独作句子成分。介词后面一般有名词、代词或相当于名词的其他词类、短语或从句作它的宾语，表示与其他成分的关系。介词和它的宾语构成介词词组，在句中作状语，表语，补语，定语或介词宾语。

参考例句：

Preposition is abbreviated as "prep" in this dictionary.

介词在词典中略作 “prep”。

In English there are a lot of verbs collocating with the preposition on

英语中有许多动词与介词on搭配。

Of or relating to an affix or a construction,such as a prepositional phrase,characteristic of the genitive case.

领属关系的属于或关于词缀或句法结构的，例如介词词组，表示所有格特征的

In its prepositional use alongside may optionally be accompanied by of:The barge lay alongside,or alongside of,the pier.

在介词用法里alongside后可以选择性地跟of:驳船停在旁边或靠码头旁边

Relating to,composed of,or used as a preposition.

介词的与介词有关的、由介词组成的或用作介词的

The verb"abide"is construed with the preposition"by".

动词abide与介词by连用。

"Out" is also used as a preposition.

"Out"也被用作介词。

After a preposition whether must be used

在介词之后只能用

A noun or substantive following and governed by a preposition.

宾语在介词后或受制于介词的名词或名词性词组

Used only as the object of a v or prep

仅用作动词或介词的宾语

preposition是什么意思：

n. 介词

Relating to,composed of,or used as a preposition.

介词的与介词有关的、由介词组成的或用作介词的

The words'in','from','out' and 'of are prepositions.

in，from，out，以及of都是介词。

artillery that was prepositioned at strategic points in the desert.

预先放置在沙漠中战略要点处的军火

A noun or substantive following and governed by a preposition.

宾语在介词后或受制于介词的名词或名词性词组

Notice that they are used with a variety of preposition and particle.

注意这些词总是与各类介词及小品词连用。