stim ‧ u ‧ lant /ˈstɪmjələnt, ˈstɪmjʊlənt/ BrE AmE noun [countable]
1 . a drug or substance that makes you feel more active and full of energy:
artificial stimulants
2 . something that encourages more of a particular activity SYN stimulus :
economic stimulants
stimulant to
Increases in new construction would be a stimulant to the economy.
—stimulant adjective :
a drug with stimulant properties