/ ˈsɪlədʒɪzəm; NAmE / noun
( technical ) a way of arguing in which two statements are used to prove that a third statement is true, for example: 'All humans must die; I am a human; therefore I must die.'
► syl·lo·gist·ic / ˌsɪləˈdʒɪstɪk; NAmE / adjective [ only before noun ]
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WORD ORIGIN
late Middle English : via Old French or Latin from Greek sullogismos , from sullogizesthai , from sun- with + logizesthai to reason (from logos reasoning).