Something done as an action or a movement.
The lexical aspect (aktionsart) of verbs or predicates that change over time and have no natural end point.
Something done for pleasure or entertainment, especially one involving movement or an excursion.
The state or quality of being active; activeness.
The number of radioactive decays per unit time. Unit for it: becquerel or curie
The propery of substances to react with other substances
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