The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

   Syn: Liveliness; briskness; quickness.
        [1913 Webster]