particle

1. at (place, time); in; on; during
2. to (direction, state); toward; into
3. for (purpose)
4. because of (reason); for; with
5. by; from
6. as (i.e. in the role of)
7. per; in; for; a (e.g. "once a month")
8. and; in addition to
9. archaic if; although