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

 

tau

 noun
noun
BrE BrE//tɔː//
 
; NAmE NAmE//tɔː//
 
; BrE BrE//taʊ//
 
; NAmE NAmE//taʊ//
 
 
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the 19th letter of the Greek alphabet (T, τ) Word OriginGreek.
See the Oxford Advanced American Dictionary entry: tau