strat ‧ a ‧ gem /ˈstrætədʒəm/ BrE AmE noun [countable]
[ Date: 1400-1500 ; Language: Italian ; Origin: stratagemma , from Latin , from Greek stratagema , from stratagein 'to lead an army' , from strategos 'general' , from stratos 'army' + agein 'to lead' ]
formal a trick or plan to deceive an enemy or gain an advantage SYN ploy