Meaning

noun a message expressing an opinion based on incomplete evidence

noun a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)

noun an investment that is very risky but could yield great profits

originEtymology tree Middle English speculation English speculation From Middle English speculacioun, speculation, from Old French speculation (compare French spéculation), from Late Latin speculātiō, speculātiōnem, from Latin speculor. Morphologically speculate + -ion.

Etymology from Wiktionary, CC BY-SA 3.0