Preposition
a part of speech, so named because originally prefixed to the verb, in order to modify its meaning.
Prepositions are either simple or compound. Simple prepositions are at, by, for, from, in, on, out, to, up, with; compound prepositions are across, after (a comparative from of), against, above, about, along, amid, amidst, among, athwart, but, into, over, through, toward, until, unto, within, without. The prepositions concerning, during, except, notwithstanding, outtake, etc., arise out of a participial construction.