Meaning

noun a personal belief or judgment that is not founded on proof or certainty

noun 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

noun a belief or sentiment shared by most people; the voice of the people

originFrom English opine + -ion, from Middle English opinion, opinioun, from Anglo-Norman and Middle French opinion, from Latin opīniō, from opīnor (“to opine”). Displaced native Old English wēna.

Etymology from Wiktionary, CC BY-SA 3.0