The noun opinion has 6 senses (first 5 from tagged texts)
1. (408) opinion, sentiment, persuasion, view, thought -- (a personal belief or judgment that is not founded on proof or certainty; "my opinion differs from yours"; "what are your thoughts on Haiti?")
2. (76) public opinion, popular opinion, opinion, vox populi -- (a belief or sentiment shared by most people; the voice of the people; "he asked for a poll of public opinion")
3. (51) opinion, view -- (a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof; "his opinions appeared frequently on the editorial page")
4. (34) opinion, legal opinion, judgment, judgement -- (the legal document stating the reasons for a judicial decision; "opinions are usually written by a single judge")
5. (10) opinion, ruling -- (the reason for a court's judgment (as opposed to the decision itself))
6. impression, feeling, belief, notion, opinion -- (a vague idea in which some confidence is placed; "his impression of her was favorable"; "what are your feelings about the crisis?"; "it strengthened my belief in his sincerity"; "I had a feeling that she was lying")