Tending to produce excitation.
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ex·cit·ato·ry ik-'sīt-ə-.tōr-ē, -.tȯr- adj
1) tending to induce excitation (as of a neuron) <\excitatory substances> <\excitatory and inhibitory pathways from the brain (W. G. Van der Kloot)>
2) exhibiting, resulting from, related to, or produced by excitement or excitation <an \excitatory postsynaptic potential>
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ex·ci·ta·to·ry (ek-siґtə-tor″e) causing excitation.Medical dictionary. 2011.