Webster's English Dictionary

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activity

ac.tiv.i.ty \ak-'tiv-*t-e-\ n 1: the quality or state of being active  2: 
   vigorous or energetic action : LIVELINESS  3: a natural or normal function 
   : as  3a: a process that an organism carries on or participates in by 
   virtue of being alive 3b: any similar process actually or potentially 
   involving mental function;  specif : an educational procedure designed to 
   stimulate learning by firsthand experience 4: an active force  5a: a 
   pursuit in which a person is active  5b: a form of organized, supervised, 
   often extracurricular recreation  6: an organizational unit for performing 
   a specific function; also :: its function or duties