[ac.tiv.i.ty] n, pl -ties (1530) 1: the quality or state of being active
2: vigorous or energetic action: liveliness
3: natural or normal function: as a: a process (as digestion) that an organism carries on or participates in by virtue of being alive b: a similar process actually or potentially involving mental function; specif: an educational procedure designed to stimulate learning by firsthand experience
4: an active force
5. a: a pursuit in which a person is active b: a form of organized, supervised, often extracurricular recreation
6: an organizational unit for performing a specific function; also: its function or duties