as

adverb

1
as if!
used to humorously express extreme scepticism
She says that if she won a million dollars she would spend it on charity. As if!
Submitted by:
Boris Marchenko from Russian Federation on 08/06/2017
Open Dictionary - June2017

as

adverb

1
as if!
used to humorously express extreme scepticism
She says that if she won a million dollars she would spend it on charity. As if!
Submitted by:
Boris Marchenko from Russian Federation on 08/06/2017
Open Dictionary - June2017

as

adverb, conjunction, preposition

strongUK /æz/

weakUK /əz/

As can be used in the following ways:

as a conjunction (connecting two clauses): As I was leaving, the phone rang.The results were not as bad as I had expected.

as a preposition (followed by a noun): He works as a waiter.

as an adverb (followed by an adjective, an adverb, or a word such as ‘much’ or ‘many’): Nylon is cheaper than leather, and it’s just as strong.

1
used for showing comparison
1. 1a
  used for comparing one person, thing, or situation with another
  as...as:
  Simon isn’t as tall as his brother.
  I don’t play football as much as I used to.
  I can’t run as fast as you.
  just as:
  We all need regular exercise, but a healthy diet is just as important.
  half/twice/three times etc as much:
  A house in London costs twice as much as a similar house in Liverpool.
  the same as:
  Barbara’s suggestion was almost exactly the same as mine.
  Synonyms and related words
  Ways of comparing things
  than
  relatively
  whereas
2. 1b
  used in particular expressions for emphasizing a quality in someone or something
  Her skin was white as snow.
  as tough as old boots
See alsoless
2
spokenused for mentioning that something is already known or has already been talked about
As I was saying, we expect next year to be a good year.
As everyone knows, the farming industry is in serious difficulties.
3
used for saying that something happens or is done in the same way
I invested the money as you suggested.
Leave everything just as you found it.
as usual:
Judith was late, as usual.
as with:
As with all business cards, good design is essential.
4
used for referring to what someone or something does or how they appear
As managing director, I am expected to provide effective leadership.
a portrait of the princess as a child
An electric drill can also be used as a screwdriver.
5
used for saying that someone or something is considered or described in a particular way
Van Dyck was regarded as the greatest painter of his time.
The result of the vote is being seen as a personal victory for the Prime Minister.
as being/having:
Madeira is described as having the best climate in the world.
6
used for saying that something happens at the same time as something else
As we were sitting down to dinner, the phone rang.
just as:
We got to the check-in desk just as they were about to close.
Synonyms and related words
Happening or done at the same time
when
while
simultaneous
7
used for giving the reason for something
As it was getting late, we decided to go home.
We chose Calvert to lead us as he said he knew the way.
Synonyms and related words
Ways of explaining or clarifying
after all
as
as a matter of fact
8
used after an adjective or adverb to mean that something is true despite what you are saying
Strange as it may seem, I never really wanted to be rich.
Much as I sympathize with your difficulties, there is little I can do to help you.

phrases

as...as usual/possible/necessary/expected

as for

as if

as is

as is/does/has etc someone

as it is

as it is/as it turns out

as it were

as of/as from

as soon as

as to

it’s not as if...

as