To have an opinion is to think-
The word “opinion” comes from the Latin “opinio,” which means “conjecture, belief, what one thinks.” The root of “opinio” is “opinari,” which means “to suppose, to imagine, to think, to judge.” This Latin root is also the source of the English word “opine,” which means to express an opinion. The evolution of the term reflects the process of forming and expressing personal beliefs or judgments that are not necessarily based on fact or knowledge. Over time, “opinion” has come to signify a more general concept of beliefs or judgments that individuals hold, regardless of their factual accuracy or the strength of their underpinning evidence.