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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
Wiktionary(3.00 / 1 vote)Rate this definition: 1  speculation(Noun) The process of thinking or meditating on a subject. 2  speculation(Noun) A judgment or conclusion reached by speculating. 3  speculation(Noun) An investment involving higher than normal risk in order to obtain a higher than normal return.