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Definition of as preposition from the Oxford Advanced Learner's Dictionary

as

preposition
 
/əz/, strong form
 
/æz/
 
/əz/, strong form
 
/æz/
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  1. used to describe somebody/something appearing to be somebody/something else
    • They were all dressed as clowns.
    • The bomb was disguised as a package.
  2. used to describe the fact that somebody/something has a particular job or function
    • She works as a courier.
    • Treat me as a friend.
    • I respect him as a doctor.
    • You can use that glass as a vase.
    • The news came as a shock.
    • She had been there often as a child (= when she was a child).
  3. Word OriginMiddle English: reduced form of Old English alswā ‘similarly’ (see also).
See as in the Oxford Advanced American DictionarySee as in the Oxford Learner's Dictionary of Academic English
hat-trick
noun
 
 
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