o·pin·ion əˈpinyən/ noun a view or judgment formed about something, not necessarily based on fact or knowledge. "I'm writing to voice my opinion on an issue of great importance" synonyms: belief, judgment, thought(s), (way of) thinking, mind, (point of) view, viewpoint, outlook, attitude, stance, position, perspective, persuasion, standpoint; More the beliefs or views of a large number or majority of people about a particular thing. "the changing climate of opinion" an estimation of the quality or worth of someone or something. "I had a higher opinion of myself than I deserved"