1. activity

any specific behavior

Example Sentences:
'they avoided all recreational activity'

2. action, activeness, activity

the state of being active

Example Sentences:
'his sphere of activity'
'he is out of action'

• action
• activeness

3. activity, bodily function, bodily process, body process

an organic process that takes place in the body

Example Sentences:
'respiratory activity'

• bodily function
• bodily process
• body process

4. activity

(chemistry) the capacity of a substance to take part in a chemical reaction

Example Sentences:
'catalytic activity'

5. action, activity, natural action, natural process

a process existing in or produced by nature (rather than by the intent of human beings)

Example Sentences:
'the action of natural forces'
'volcanic activity'

• action
• natural action
• natural process

6. activeness, activity

the trait of being active; moving or acting rapidly and energetically

Example Sentences:
'the level of activity declines with age'

• activeness