prep.

/P R EH1 P/
noun
  1. 1

    (grammar, strict sense) Any of a class of non-inflecting words typically employed to connect a following 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.

  2. 2

    A proposition; an exposition; a discourse.

Source: https://en.wiktionary.org/wiki/prep., https://en.wiktionary.org/wiki/preposition