on
Definition
- adj. in operation or operational
- adj. (of events) planned or scheduled
- adv. indicates continuity or persistence or concentration
- adv. in a state required for something to function or be effective
Example sentences
prep.
The book is on the table.
adv.
She climbed on to the roof to get a better view.
a.
The heater is on, so the room will warm up soon.
[计]
Please turn the computer on before the meeting starts.