Refers to a neural synapse or weight that is positive such that activity in the source neuron encourages activity in the connected neuron; the opposite of inhibitory. Found on http://www.encyclo.co.uk/local/20090
Ex·cit'a·to·ry adjective [ Confer French excitatoire .] Tending to excite; containing excitement; excitative. Found on http://www.encyclo.co.uk/webster/E/82