What is the meaning of opinion?

noun

• A personal belief or judgment that is not founded on proof or certainty.
  • usage: "my opinion differs from yours"; "I am not of your persuasion"; "what are your thoughts on Haiti"
  • synonyms: sentiment, persuasion, view, thought
• 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.
  • usage: "his opinions appeared frequently on the editorial page"
  • synonyms: view
• A belief or sentiment shared by most people; the voice of the people.
  • usage: "he asked for a poll of public opinion"
  • synonyms: public opinion, popular opinion, vox populi
• The legal document stating the reasons for a judicial decision.
  • usage: "opinions are usually written by a single judge"
  • synonyms: legal opinion, judgment, judgement
• The reason for a court's judgment (as opposed to the decision itself.
  • synonyms: ruling
• A vague idea in which some confidence is placed.
  • usage: "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"
  • synonyms: impression, feeling, belief, notion