Definition of devout adjective from the Oxford Advanced Learner's Dictionary

 

devout

 adjective
adjective
BrE BrE//dɪˈvaʊt//
 
; NAmE NAmE//dɪˈvaʊt//
 
 
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(of a person) believing strongly in a particular religion and obeying its laws and practices a devout Christian/Muslim Word Origin Middle English: from Old French devot, from Latin devotus ‘devoted’, past participle of devovere, from de- ‘formally’ + vovere ‘to vow’.
See the Oxford Advanced American Dictionary entry: devout