Learner's definition of OPINION
1 : a belief, judgment, or way of thinking about something: what someone thinks about a particular thing
Why ask (for) my opinion if you have already decided?
I value your opinion. [=I respect the way you think about things]
We asked for their opinions about/on the new stadium.
In my opinion, it's the best car on the market.
Most of the people surveyed have a high/low opinion of the organization. [=most of the people surveyed think that the organization is good/bad]
She has enough knowledge of the system to offer an informed opinion [=an opinion based on information] of why it isn't working.
The meeting will give residents a chance to listen to some expert opinions. [=opinions of experts]
The owner of the store is often there to offer customers expert opinion. [=an expert's opinion]
Which one is better is a matter of opinion. [=people have different opinions about which one is better]
I'm glad that we can have a difference of opinion [=we can disagree] and still be friends.
The general opinion is that the players are paid too much. [=most people think that the players are paid too much]
The company has been unsuccessful in its efforts to sway/change public opinion. [=to change what most people think]
Contrary to popular opinion [=despite what many people think], fame does not always bring happiness.
2 [count] : advice from someone with special knowledge: advice from an expert
We're still seeking medical opinions [=advice from doctors] on the cause of the pain.
My doctor says I need surgery, but I'm going to get a second opinion. [=advice from a second doctor to make sure advice from the first doctor is correct]
3 [count], technical : a formal statement by a judge, court, etc., explaining the reasons a decision was made according to laws or rules
be of the opinion
: to have a specified opinion or belief
the court of public/world opinion