WordReference Random House Learner's Dictionary of American English © 2015
prep•o•si•tion1 /ˌprɛpəˈzɪʃən/USA pronunciation n. [countable]

    Grammarone of a group of words used before nouns and pronouns to form phrases that give more information about a verb, noun, or other phrase, usually expressing a relationship of time, place, or the like:Some prepositions in English are on, by, to, with, or since.
prep•o•si•tion•al, adj. [before a noun]:The phrase at 17 Lexington Avenue is a prepositional phrase.See -pos-.

Collins Concise English Dictionary © HarperCollins Publishers::

preposition /ˌprɛpəˈzɪʃən/ n
  1. a word or group of words used before a noun or pronoun to relate it grammatically or semantically to some other constituent of a sentence
Etymology: 14th Century: from Latin praepositiō a putting before, from pōnere to place

ˌprepoˈsitional adj ˌprepoˈsitionally adv USAGE
The practice of ending a sentence with a preposition (Venice is a place I should like to go to) was formerly regarded as incorrect, but is now acceptable and is the preferred form in many contexts

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