Definition of preposition noun from the Oxford Advanced American Dictionary

 

preposition

 noun
noun
NAmE//ˌprɛpəˈzɪʃn//
 
(grammar)
 
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a word or group of words, such as in, from, to, out of, and on behalf of, used before a noun or pronoun to show place, position, time, or method
prepositional
 
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NAmE//ˌprɛpəˈzɪʃənl//
 
adjective a prepositional phrase (= a preposition and the noun following it, for example at night or after breakfast)
See the Oxford Advanced Learner's Dictionary entry: preposition