Meaning of ACTIVITY in English

ACTIVITY

n. (pl. -ies)

1. a the condition of being active or moving about. b the exertion of energy; vigorous action.

2 (often in pl.) a particular occupation or pursuit (outdoor activities).

3 RADIOACTIVITY.

Etymology: F activit{eacute} or LL activitas (as ACTIVE)

Oxford English vocab.      Оксфордский английский словарь.