Relating to or producing excitement or stimulation, especially in biological or neural contexts.
From Latin 'excitare' (to rouse, stir up) + '-tory' suffix meaning 'relating to or serving to.' The root evolved from 'ex-' (out) + 'citare' (to move), originally describing the act of rousing something into action.
Your nervous system uses excitory signals constantly—when a neurotransmitter excites a nerve cell, it's literally telling that cell 'wake up and fire!' Without excitory signals, you couldn't move, think, or feel anything.
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