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

 

mantra

 noun
noun
BrE BrE//ˈmæntrə//
 
; NAmE NAmE//ˈmæntrə//
 
 
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a word, phrase or sound that is repeated again and again, especially during prayer or meditation a Buddhist mantra Word Origin late 18th cent.: Sanskrit, literally ‘instrument of thought’, from man ‘think’.
See the Oxford Advanced American Dictionary entry: mantra