before

Definitions
Examples

(adverb): At an earlier time.
(adverb): In advance.
(adverb): At the front end.
(preposition): Earlier than (in time).
(preposition): In front of in space.
(preposition): In the presence of.
(preposition): Under consideration, judgment, authority of (someone).
(preposition): In store for, in the future of (someone).
(preposition): In front of, according to a formal system of ordering items.
(preposition): At a higher or greater position than, in a ranking.
(conjunction): In advance of the time when.
(conjunction): Rather or sooner than.

I've never done this before.
I want this done before Monday.
He stood before me.
He performed before the troops in North Africa.
The case laid before the panel aroused nothing but ridicule.