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