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

BrE BrE//ˈpɒstjʊlət//
 
; NAmE NAmE//ˈpɑːstʃələt//
 
(formal) a statement that is accepted as true, that forms the basis of a theory, etc. Work done in the laboratory showed that his postulates were probably correct.
Word Origin late Middle English: from Latin postulat- ‘asked’, from the verb postulare.
See the Oxford Advanced American Dictionary entry: postulate

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