Definition of “as” - English Dictionary

“as” in British English

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asadverb

uk strong /æz/ weak /əz/ us strong /æz/ weak /əz/

aspreposition

uk strong /æz/ /əz/ us /æz/ /əz/

A1 used to describe the purpose or quality of someone or something:

She works as a waitress.
It could be used as evidence against him.
The news came as quite a shock to us.
I meant it as a joke.

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asconjunction

uk strong /æz/ /əz/ us /æz/ /əz/

as conjunction (BECAUSE)

A2 because:

As it was getting late, I decided to book into a hotel.
You can go first as you're the oldest.

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as conjunction (LIKE)

B1 in the same way:

He got divorced, (just) as his parents had done years before.
This year, as in previous years, tickets sold very quickly.
As with his earlier movies, the special effects in his latest film are brilliant.
As is often the case with children, Amy was completely better by the time the doctor arrived.
As I was just saying, I think the proposal needs further consideration.
Knowing him as I do, I can't believe he would do such a thing.

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Grammar

(Definition of “as” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“as” in American English

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aspreposition, conjunction, adverb [ not gradable ]

us /æz, əz/

aspreposition

us /æz, əz/

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.

asconjunction

us /æz, əz/

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)

“as” in Business English

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asadverb

uk /æzˌ əz/ us
as at

ACCOUNTING at a particular date or time:

All rates correct as at March 1 2011.
as from

from a particular date or time:

As from April 6, your pension payments will increase.
as is UK also as seen

COMMERCE used to state that something is being sold in its present condition, and to say that the person selling it is not responsible for anything that might be wrong with it:

This guarantee does not cover products sold "as is".
as is, where is

COMMERCE used to state that something is being sold in its present condition and at the place where it is at present, and to say that the person selling it is not responsible for anything that might be wrong with it:

This item is being sold as is, where is, with no warranty, written or implied.
as of

at a particular date or time:

The data is correct as of May 13.
This issue may need attention later but, as of now, we are happy with the decision that we have taken.

ACCOUNTING from a particular date or time:

The tax consequences of this sort of transaction will change as of October 1.
as per

according to what has been agreed or stated:

They made payments of $1,000 a year, as per agreement.
We shall proceed as per your instructions.
as seen

UK also →  as is :

We sold the car with a receipt saying 'sold as seen'.

(Definition of “as” from the Cambridge Business English Dictionary © Cambridge University Press)