Definition of "excitatory" [ex•cit•a•to•ry]

• Stimulating, exciting or causing excitation; excitative (adjective)

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• "Those that make you feel energized, excited, and stimulated, and help you focus, learn, and remember, are called excitatory neurotransmitters."
• "The majority of brain cells are called excitatory because they ramp up the action of target cells."
• "In later work, which got little attention in the West, Pavlov sought to prove that dogs are of four temperamental types, "strong excitatory," "lively," "calm imperturbable, or phlegmatic," and "weak inhibitory.""