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

 

stratagem

 noun
noun
BrE BrE//ˈstrætədʒəm//
 
; NAmE NAmE//ˈstrætədʒəm//
 
(formal)
 
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a trick or plan that you use to gain an advantage or to trick an opponent to adopt a cunning stratagem He deployed various cunning stratagems. Word Origin late 15th cent. (originally denoting a military ploy): from French stratagème, via Latin from Greek stratēgēma, from stratēgein ‘be a general’, from stratēgos, from stratos ‘army’ + agein ‘to lead’.
See the Oxford Advanced American Dictionary entry: stratagem