To stir to activity. To call forth (a reaction or emotion, for example); elicit: odd noises that excited our curiosity. To arouse strong feeling in: speakers who know how to excite a crowd. See Synonyms at provoke. Physiology To produce increased activity or response in (an organ, tissue, or part); stimulate. Physics To increase the energy of. Physics To raise (an atom, for example) to a higher energy level.