A word or phrase able to connect a following noun or noun phrase (and often other parts of the speech) as a complement to some other part of the sentence, expressing a relation between them.
a function word that combines with a noun or pronoun or noun phrase to form a prepositional phrase that can have an adverbial or adjectival relation to some other word
(linguistics) the placing of one linguistic element before another (as placing a modifier before the word it modifies in a sentence or placing an affix before the base to which it is attached)
