as of Definition

as¹
conj

1. When; while; during.

Example: met him as I was coming out of the shop
2. Because; since.

Example: didn't go as it was raining
3. In the manner that.

Example: fussing as only a mother can
4. That which; what.

Example: Do as you're told
5. To the extent that.

Example: Try as he might, he still couldn't reach
6. For instance.

Example: large books, as this one for example
7. In the same way that.

Example: married late in life, as his father had done
8. Used to refer to something previously said, done, etc: like; just like.

Example: As Frank says, the job won't be easy

prep

1. In the role of something.

Example: speaking as her friend

adverb

1. Equally.

Example: It was really hot yesterday, but I don't think today is as hot

Idiom: as ... as ...

Used in similes and for comparison: denoting that the things compared are the same or share the expected quality or characteristic.
Example: as sly as a fox
Example: as sly as his brother
Example: not as sly as he used to be

Idiom: as for something or someone (as to something or someone)

With regard to it or them; concerning it or them.
Example: And as for Harry, he's just mad
Thesaurus: with regard to, with respect to, with relation to, in reference to, on the subject of, as regards.

Idiom: as from (as of)

Starting on or at (a particular time).
Example: As from Monday, we'll be open till ten

Idiom: as if!

colloq
Short form of as if I would etc: an exclamation that questions or negates what has just been said.

Idiom: as if (as though)

As he, she, etc would if.
Example: behaved as if nothing had happened

Idiom: as it is

The way things are at the moment.
Example: I think you've drunk enough as it is

Idiom: as it were

In a way; to some extent.
Thesaurus: so to say, so to speak, in a way, in a manner of speaking, in some way.

Idiom: as much

The same; what amounts to that.
Example: I thought as much

Idiom: as well

Also.

Idiom: as yet

Until now.

Idiom: so as to

In order to.

Etymology: Anglo-Saxon eallswa just as.