Definition of as preposition from the Oxford Advanced American Dictionary



    , NAmE//æz//
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  1. 1used to describe someone or something appearing to be someone or something else They were all dressed as clowns. The bomb was disguised as a package.
  2. 2used to describe the fact that someone or 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).
Which Word?as / like You can use both as and like to say that things are similar. Like is a preposition and is used before nouns and pronouns:He has blue eyes like me. As is a conjunction and an adverb and is used before a clause, another adverb, or a phrase beginning with a preposition:She enjoys all kinds of music, as do I. As always, he said little. In spoken English, like is frequently used as a conjunction or an adverb instead of as:Nobody understands him like I do. I don’t want to upset him again like before.It is also used instead of as if:It looks like we’re going to be late. You will find more help on the use of as and like in the entries for particular verbs, such as act, behave, etc.
See the Oxford Advanced Learner's Dictionary entry: as