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

 

protestation

 noun
noun
BrE BrE//ˌprɒtəˈsteɪʃn//
 
; NAmE NAmE//ˌprɑːtəˈsteɪʃn//
 
[countable, uncountable](formal)
 
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a strong statement that something is true, especially when other people do not believe you She repeated her protestation of innocence. Despite his protestation to the contrary, he was extremely tired. Word Origin Middle English: from Old French, from late Latin protestatio(n-), from protestari ‘to protest’, from pro- ‘forth, publicly’ + testari ‘assert’ (from testis ‘witness’).
See the Oxford Advanced American Dictionary entry: protestation