/ kənˈkluːsɪv; NAmE / adjective
proving sth, and allowing no doubt or confusion :
conclusive evidence / proof / results
OPP inconclusive
► con·clu·sive·ly adverb :
to prove sth conclusively
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WORD ORIGIN
late 16th cent. (in the sense summing up ): from late Latin conclusivus , from Latin conclus- closed up, from the verb concludere , from con- completely + claudere to shut.