English

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

 

warlock

 noun
noun
BrE BrE//ˈwɔːlɒk//
 
; NAmE NAmE//ˈwɔːrlɑːk//
 
 
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a man who is believed to have magic powers, especially evil ones Word Origin Old English wǣrloga ‘traitor, scoundrel, monster’, also ‘the Devil’, from wǣr ‘covenant’ + an element related to lēogan ‘belie, deny’. From its application to the Devil, the word was transferred in Middle English to a person in league with the Devil, and hence a sorcerer. It was chiefly Scots until given wider currency by Sir Walter Scott.
See the Oxford Advanced American Dictionary entry: warlock