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[C] a thought or belief about something or someoneWhat's your opinion about/on the matter?
People tend to have strong opinions on capital punishment.
He didn't express/give an opinion on the matter.
Who, in your opinion, (= Who do you think) is the best football player in the world today?
He's very much of the opinion that alternative medicine is a waste of time.
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[U] the thoughts or beliefs that a group of people haveEventually, the government will have to take notice of public opinion.
There is a diverse range of opinion on the issue.
There was a difference of opinion as to the desirability of the project.
Opinion is divided as to whether the treatment actually works.
Both performances were excellent, it's simply a matter of opinion as to whose was better.
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[C] a judgment about someone or somethingHer opinion of Adam changed after he'd been so helpful at the wedding.
She has a good/high opinion of his abilities (= thinks he is good).
I have a rather bad/low/poor opinion of my sister's boyfriend (= I do not like or approve of him).
He has a very high opinion of himself (= thinks he is very skilled/clever in a way that is annoying).
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[C] a judgment made by an expertMy doctor has referred me to a specialist for a second opinion on the results of my blood test.