activity

Noun

Synonyms: action activeness bodily process body process bodily function natural process natural action

WordNet 3.0

Noun (6)

any specific behavior“they avoided all recreational activity”
the state of being active“his sphere of activity”“he is out of action”Synonyms: action activeness
an organic process that takes place in the body“respiratory activity”Synonyms: bodily process body process bodily function
(chemistry) the capacity of a substance to take part in a chemical reaction“catalytic activity”
a process existing in or produced by nature (rather than by the intent of human beings)“the action of natural forces”“volcanic activity”Synonyms: natural process natural action action
the trait of being active; moving or acting rapidly and energetically“the level of activity declines with age”Synonyms: activeness

Webster's Dictionary (GCIDE)

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]