"What is a preposition"@en . "prep\u00B7o\u00B7si\u00B7tion1 [prep-uh-zish-uhn] Show IPA noun Grammar . any member of a class of words found in many languages that are used before nouns, pronouns, or other substantives to form phrases functioning as modifiers of verbs, nouns, or adjectives, and that typically express a spatial, temporal, or other relationship, as in, on, by, to, since. Origin: 1350\u20131400; Middle English preposicioun < Latin praepositi\u014Dn- (stem of praepositi\u014D ) a putting before, a prefix, preposition. See pre-, position"@en . . . . "prep\u00B7o\u00B7si\u00B7tion1 [prep-uh-zish-uhn] Show IPA noun Grammar . any member of a class of words found in many languages that are used before nouns, pronouns, or other substantives to form phrases functioning as modifiers of verbs, nouns, or adjectives, and that typically express a spatial, temporal, or other relationship, as in, on, by, to, since. Origin: 1350\u20131400; Middle English preposicioun < Latin praepositi\u014Dn- (stem of praepositi\u014D ) a putting before, a prefix, preposition. See pre-, position"@en .