speculate - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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speculate

verb [I] uk   us   /ˈspek.jʊ.leɪt/

speculate verb [I] (GUESS)

C2 to guess possible answers to a question when you do not have enough information to be certain: I don't know why she did it - I'm just speculating. A spokesperson declined to speculate on the cause of the train crash. Journalists are speculating about whether interest rates will be cut. [+ that] The newspapers have speculated that they will get married next year.
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speculate verb [I] (TRADE)

to buy and sell in the hope that the value of what you buy will increase and that it can then be sold at a higher price in order to make a profit: He made his money speculating on the London gold and silver markets. The company has been speculating in property for years.
(Definition of speculate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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