preposition
noun
°A closed class of non-inflecting words typically employed to connect a noun or a pronoun, in an adjectival or adverbial sense, with some other word: a particle used with a noun or pronoun (in English always in the objective case) to make a phrase limiting some other word.
°(obsolete) A proposition; an exposition; a discourse.
verb
°To place in a location before some other event occurs.