1. : to form an opinion of from little or no evidence. She could only guess what he meant. 2. : believe, suppose. I guess you're right. 3. : to arrive at a correct conclusion about by conjecture, chance, or intuition. guess the answer. intransitive verb. : to make a guess. We can only guess at what really happened. guessable. ˈge-sə-bəl. adjective. More @Wikipedia
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