1. (

• activity

) any specific behavior; "they avoided all recreational activity" ;

2. (

• action ,
• activity ,
• activeness

) the state of being active; "his sphere of activity"; "he is out of action" ;

3. (

• bodily_process ,
• body_process ,
• bodily_function ,
• activity

) an organic process that takes place in the body; "respiratory activity" ;

4. (

• activity ,

) (chemistry) the capacity of a substance to take part in a chemical reaction; "catalytic activity" ;

5. (

• 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. (

• activeness ,
• activity

) the trait of being active; moving or acting rapidly and energetically; "the level of activity declines with age" ;