adverb

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

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

2. 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”

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

preposition

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

   “They're big as houses.”

2. In the role of.

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

conjunction

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

   “As you wish, my lord!”

2. At the time that; during the time when:

3. Being that, considering that, because, since.

   “As it’s too late, I quit.”

Synonyms: while, whilst, given that, seeing that, albeit, although