Definition of thrice adverb from the Oxford Advanced Learner's Dictionary

 

thrice

 adverb
adverb
BrE BrE//θraɪs//
 
; NAmE NAmE//θraɪs//
 
(old use or formal)
 
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three times Word Origin Middle English thries, from earlier thrie (from Old English thrīga, related to three) + -s (later respelled -ce to denote the unvoiced sound); compare with once.
See the Oxford Advanced American Dictionary entry: thrice