on

on adv

see on, prep.

1. Contiguous to someone; in contact with something.

on prep

OE.

1. In; within.
2. At the surface of.
3. Along; beside.
4. During; at the time of.
5. Contiguous to; placed at; set down at.
6. To; towards; in the direction of.
7. Against; pushing at.
8. Because of; thanks to; with the help of.