Estimate or conclude (something) without sufficient information to be sure of being correct:

“she guessed the child’s age at 14 or 15”

Form a correct conclusion about (something) by guessing

(I guess) informal Used to indicate that although one thinks or supposes something, it is without any great conviction or strength of feeling:
“I guess I’d better tell you everything”

It can also be a noun:

“my guess is that within a year we will have a referendum”

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