(preposition)
In the most general sense, indicating that in consideration of, in view of, or with reference to, which anything is done or takes place.
(conjunction)
Because; by reason that; for that; indicating, in Old English, the reason of anything.
(noun)
One who takes, or that which is said on, the affirmative side; that which is said in favor of some one or something; the antithesis of against, and commonly used in connection with it.