on
adverb
ɒn 
ɑːn ɔːn Help
For the special uses of on in phrasal verbs, look at the entries for the verbs. For example get on is in the phrasal verb section at get.
1 used to show that something continuesHe worked on without a break.If you like a good story, read on.2 used to show that somebody/something moves or is sent forwardShe stopped for a moment, then walked on.Keep straight on for the beach.From then on he never trusted her again.Please send the letter on to my new address.3 on somebody's body; being wornPut your coat on.I didn't have my glasses on.What did she have on (= what was she wearing)?4 covering, touching or forming part of somethingMake sure the lid is on.5 connected or operating; being usedThe lights were all on.The TV is always on in their house.We were without electricity for three hours but it's on again now.6 happeningThere was a war on at the time.What's on at the movies?The band are on (= performing) in ten minutes.7 planned to take place in the futureThe game is still on (= it has not been cancelled).I don't think we've got anything on this weekend.I'm sorry we can't come—we've got a lot on.8 on duty; workingI'm on now till 8 tomorrow morning.9 in or into a vehicleThe bus stopped and four people got on.They hurried on to the plane. see also ontoIdioms
be on about something
(informal) to talk about something; to mean somethingI didn't know what he was on about. It didn't make sense.be/go/keep on about something
(informal, disapproving) to talk in a boring or complaining way about somethingStop keeping on about it!be/go/keep on at somebody (to do something)
(informal, disapproving) to keep asking or telling somebody something so that they become annoyed or tiredHe was on at me again to lend him money.be on for something
(informal) to want to do somethingIs anyone on for a drink after work?it isn't on
(informal) used to say that something is not acceptableon and on
without stopping; continuously
She went on and on about her trip.