Definition of prepositions:
(n) :
(grammar, strict sense) Any of a class of non-inflecting words and multiword terms 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.
(n) :
(grammar, broad sense) An adposition.
(n) :
(obsolete) A proposition; an exposition; a discourse.
(v) :
(sometimes proscribed) Alternative spelling of pre-position. [(transitive) To position (something) ahead of time. (The objects thus positioned are usually supplies, tools, instruments, weapons, or troops.)]