›to guess possible answers to a question when you do not have enough information to be certain: speculate on/about sthJournalists are speculating about whether interest rates will be cut.A spokesperson declined to speculate on the date of the merger.speculate thatCurrency traders speculated that Japan's central bank might soon buy large amounts of dollars in the hope of preventing the yen from strengthening further
›FINANCEto buy something hoping that its value will increase and then sell at this higher price in order to make a profit: speculate on/in sthHe made his money speculating on the London gold and silver markets.The company speculates in property.