Prepositions meaning

A word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause, as in "the man on the platform," "she arrived after dinner," "what did you do it for?".

A preposition is a word which expresses relationship of a noun or a pronoun to other words of the sentence. e. g. 'in, of, to, at, by, for, with, under, above, into, onto, upon, about, behind, beside, before, after, towards, inside, outside, below, around' are commonly used examples of prepositions