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English definition of “as”

as

preposition, conjunction, adverb [not gradable]  /æz, əz/ us  

as

preposition  /æz, əz/ us  

as preposition (BEING)

appearing to be, or being: He went to the costume party dressed as a banana. As a child, Miriam had lived in India. The news came as no surprise.

as

conjunction  /æz, əz/ us  

as conjunction (BECAUSE)

because: As it was getting late, I decided to stop at a motel.

as conjunction (WHEN)

while; during the time that: As I was getting out of the car, my heel caught on something and I fell.

as conjunction (ALTHOUGH)

although: Angry as he was, he had to smile.

as conjunction (THE SAME WAY)

in the way that; like: Do exactly as I say. As is often the case with children, Aimee was completely better by the time the doctor arrived. Just as I thought, Derrick was to blame. Use your coat as a blanket.
(Definition of as from the Cambridge Academic Content Dictionary © Cambridge University Press)
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