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English definition of “guess”

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guess

verb [I/T]  /ɡes/ us  
to give an answer to a question when you do not have all the facts and so cannot be certain if you are right: [I] I didn’t know the answer, so I had to guess. [+ (that) clause] He guessed (that) she was about 50. To guess can also mean to give the correct answer: [T] She guessed the right answer. To guess also means to think or believe: [T] My plane leaves in an hour, so I guess I’d better be going. [T] "Is he going to call you back?" "I guess so."

guess

noun [C]  /ɡes/ us  
an attempt to give the right answer when you are not certain if you are right: Go on, take a guess. Someone’s guess is also an opinion about something, formed without any knowledge of the situation: I don’t know why she’s late, but my guess is she got off at the wrong exit.
(Definition of guess from the Cambridge Academic Content Dictionary © Cambridge University Press)
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