the attitude that you have toward something, especially your thoughts about how good it isopinion of: What is your opinion of her latest novel?
opinion on: His opinions on genetic testing are well known.
have a good/high/low etc. opinion of: He seems to have a low opinion of women.
give/express an opinion: The students were not given the chance to express an opinion.
form an opinion: She seems to have formed a good opinion of him.
share/be of the same opinion: My wife and I share the same opinion on smoking.
a difference of opinion: Despite our many differences of opinion, we remained good friends.
be of the opinion that: The doctor was of the opinion that surgery was unnecessary.