As

To such an extent or degree; to the same extent or degree.

"It's not as well made, but it's twice as expensive."

Considered to be, in relation to something else; in the relation (specified).

"1865, The Act of Suicide as Distinct from the Crime of Self-Murder: A Sermon"

For example; for instance. (Compare such as.)

Introducing a basis of comparison, with an object in the objective case.

"They're big as houses."

In the role of.

"He was never seen as the boss, but rather as a friend."

In the (same) way or manner that; to the (same) degree that.

"As you wish, my lord!"

At the time that; during the time when:

Being that, considering that, because, since.

"As it’s too late, I quit."

Introducing a comparison with a hypothetical state (+ subjunctive, or with the verb elided): as though, as if.

(unit of weight) A libra.

Any of several coins of Rome, coined in bronze or later copper; or the equivalent value.