What is As?

As definition and meaning on Dictionary terms:
to the same degree, amount, or extent; similarly; equally: I don’t think it’s as hot and humid today as it was yesterday.
for example; for instance: Some flowers, as the rose, require special care.

thought to be or considered to be: the square as distinct from the rectangle; the church as separate from the state.
in the manner (directed, agreed, promised, etc.): She sang as promised. He left as agreed.

(used correlatively after an adjective or adverb preceded by an adverbial phrase, the adverbial as, or another adverb) to such a degree or extent that: It came out the same way as it did before. You are as good as you think you are.
(without antecedent) in the degree, manner, etc., of or that: She’s good as gold. Do as we do.

at the same time that; while; when: as you look away.
since; because: As you are leaving last, please turn out the lights.
though: Questionable as it may be, we will proceed.
with the result or purpose: He said it in a voice so loud as to make everyone stare.
Informal. (in dependent clauses) that: I don’t know as I do.
Midland and Southern U.S. and British Dialect. than.

(used relatively) that; who; which (usually preceded by such or the same): I have the same trouble as you had.
a fact that: She did her job well, as can be proved by the records.

New England, Midland, and Southern U.S. who; whom; which; that: Them as has gets.