Definition of syllogism noun from the Oxford Advanced Learner's Dictionary

 

syllogism

 noun
noun
BrE BrE//ˈsɪlədʒɪzəm//
 
; NAmE NAmE//ˈsɪlədʒɪzəm//
 
(specialist)
 
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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.’ Word Origin late Middle English: via Old French or Latin from Greek sullogismos, from sullogizesthai, from sun- ‘with’ + logizesthai ‘to reason’ (from logos ‘reasoning’).
See the Oxford Advanced American Dictionary entry: syllogism