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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
Word Origin & History. speculation late 14c., contemplation, consideration, from O.Fr. speculation, from L.L. speculationem (nom. speculatio) contemplation, observation, from L. speculatus, pp. of speculari observe, from specere to look at, view (see scope (1)). Disparaging sense of mere conjecture is recorded from 1570s.