on

1. preposition

1)

your purse is on the hood of my car

Syn:

resting on, supported by, resting atop, touching the (upper) surface of

Ant:

under, underneath

2)

put the cushion on the chair

Syn:

so as to be resting on, on to, onto, to the (upper) surface

2. adjective

the computer's on

Syn:

functioning, in operation, working, in use, operating

Ant:

off

3. adverb

the professor droned on

See on and on below

- on and off

- on and on