What does activity mean?
The definition of activity
Ac*tiv”i*ty, n.; pl. Activities.
Etym: [Cf. F. activité, 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.

Synonyms
— Liveliness; briskness; quickness.