what is stimulant
Full Definition of STIMULANT. 1. : an agent (as a drug) that produces a temporary increase of the functional activity or efficiency of an organism or any of its parts.2. : stimulus.3.: an alcoholic beverage ânot used technically.ull Definition of STIMULANT. 1. : an agent (as a drug) that produces a temporary increase of the functional activity or efficiency of an organism or any of its parts. 2. : stimulus. 3. : an alcoholic beverage ânot used technically.