1British Englishsomeone who is right on supports social justice, equal rights, the protection of the environment etc - often used to show disapproval because someone does this in an extreme way [↪ PC, politically correct]:
It's one of those annoyingly right-on magazines about the environment.
2American Englishsomeone is right on when they say something that is correct or that you completely agree with:
Parker's column on teenage sexuality is right on.
3American Englishspokenold-fashionedused to emphasize that you agree with what someone says or does:
'Power to the people!' 'Yeah, right on.'
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
Dictionary pictures of the day
Do you know what each of these is called?
Click on any of the pictures above to find out what it is called.