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

 

soothsayer

 noun
noun
BrE BrE//ˈsuːθseɪə(r)//
 
; NAmE NAmE//ˈsuːθseɪər//
 
(old use)
 
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a person who is believed to be able to tell what will happen in the future Word Origin Middle English (in the sense ‘person who speaks the truth’) from Old English sōth (originally as an adjective in the sense ‘genuine, true’), of Germanic origin.
See the Oxford Advanced American Dictionary entry: soothsayer