Etymology
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speculate (v.)

1590s, "view mentally, contemplate" (transitive), back-formation from speculation. Also formerly "view as from a watchtower" (1610s). Intransitive sense of "pursue truth by conjecture or thinking" is from 1670s. Meaning "to invest money upon risk for the sake of profit" is from 1785. Related: Speculated; speculating.

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Definitions of speculate

speculate (v.)
to believe especially on uncertain or tentative grounds;
speculate (v.)
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion;
speculate (v.)
reflect deeply on a subject;
philosophers have speculated on the question of God for thousands of years
Synonyms: chew over / think over / meditate / ponder / excogitate / contemplate / muse / reflect / mull / mull over / ruminate
speculate (v.)
invest at a risk;
Synonyms: job
From wordnet.princeton.edu