1. one copy (of a document), one letter
2. one-way traffic
3. pure straight, winning hand containing nine consecutive tiles of the same suit (i.e. 1-9)
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. if, although