o�pin�ion n 1: a personal belief that is not founded on proof or certainty; "my opinion differs from yours"; "what are your thoughts on Haiti?" [syn: sentiment, persuasion, view, thought] 2: a belief or sentiment shared by most people; the voice of the people; "he asked for a poll of public opinion" [syn: public opinion, popular opinion, vox populi] 3: a message expressing a belief about something; "his opinions appeared frequently on the editorial page" [syn: view] 4: the legal document stating the reasons for a judicial decision; "opinions are usually written by a single judge" [syn: judgment, judgement] 5: the reason for a court's judgment (as opposed to the decision itself) [syn: ruling]