Definitions from Wiktionary ( )

▸ verb:  To reach a partly (or totally) unconfirmed conclusion; to engage in conjecture; to speculate.
▸ verb:  To solve by a correct conjecture; to conjecture rightly.
▸ verb:  (chiefly US) to suppose, to imagine (introducing a proposition of uncertain plausibility).
▸ verb:  (colloquial) To think, conclude, or decide (without a connotation of uncertainty). Usually in first person: "I guess".
▸ verb:  (obsolete) To hit upon or reproduce by memory.
▸ noun:  A prediction about the outcome of something, typically made without factual evidence or support.

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