Source : Webster's Revised Unabridged Dictionary (1913)

Activity \Ac*tiv"i*ty\, n.; pl. {Activities}. [Cf. F.
   activit['e], LL. activitas.]
   The state or quality of being active; nimbleness; agility;
   vigorous action or operation; energy; active force; as, an
   increasing variety of human activities. ``The activity of
   toil.'' --Palfrey.

   Syn: Liveliness; briskness; quickness.