preposition A word (such as between, in, or of) that indicates the relation between a word in a sentence and its object.
If the word following a preposition is the object of a verb, the preposition may be unnecessary.
Another alternative is to change the verb.
Prepositions also combine with verbs to form two-or three-word (or phrasal) verbs whose meaning cannot be understood literally (handed in, longed for). When a preposition is part of a two-or three-word verb, it is called a particle. See T2-b.