Something done for pleasure or entertainment, especially one involving movement or an excursion.
The lexical aspect (aktionsart) of verbs or predicates that change over time and have no natural end point.
Something done as an action or a movement.
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
A hobby or recreational activity, done regularly.
A discipline in track cycling where two opposing teams start on opposite sides of the track and try to catch their opponents.
The act of pursuing.