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Definition of speculate - form a theory or conjecture about a subject without firm evidence, invest in stocks, property, or other ventures in the hope of ga Definition of speculate - form a theory or conjecture about a subject without firm evidence, invest in stocks, property, or other ventures in the hope of ga dictionary thesaurus
n. 1  A speculator who buys and sells securities on the basis of small short-term price movements. 2  The practice of trading in such a way that all transactions are finished in one trading day and all holdings are liquefied by the end of that day.