The act of exciting or putting in motion; the act of rousing up or awakening.
The activity produced in an organ, tissue, or part, such as a nerve cell, as a result of stimulation
The act of producing excitement (stimulation); also, the excitement produced.
A transition of a nucleus, atom or molecule to an excited state by the absorption of a quantum of energy; the opposite of relaxation
Agitation; the state of being perturbed
Variation in an orbit due to the influence of external bodies
A small change in a physical system, or more broadly any definable system (such as a biological or economic system)