Meaning of ACTIVITY in English

noun (plural -ties) Date: 1530 the quality or state of being active, vigorous or energetic action ; liveliness, natural or normal function: as, a process (as digestion) that an organism carries on or participates in by virtue of being alive, a similar process actually or potentially involving mental function, an active force, 5. a pursuit in which a person is active, a form of organized, supervised, often extracurricular recreation, an organizational unit for performing a specific function

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.