Before
/bɪˈfɔː/
adverb
At an earlier time.
“I've never done this before.”
In advance.
At the front end.
Synonyms: previously, in front, ahead
preposition
Earlier than (in time).
“I want this done before Monday.”
In front of in space.
“He stood before me.”
In the presence of.
“He performed before the troops in North Africa.”
Synonyms: by, ere, no later than, previous to, prior to, ahead of, ahead of, in front of
conjunction
In advance of the time when.
Rather or sooner than.
“I'll die before I'll tell you anything about it.”
Synonyms: lest