Meaning of ACTIVITY in English

[noun]There was a lot of activity (= people busy doing things) in preparation for the Queen's visit. [U]There's usually little political activity in August. [U]There was a sudden flurry of activity when the director walked in. [U]Ministers are concerned by the low level of economic activity. [U]Garden plants are finally showing signs of activity after the long winter. [U]The whole family was found guilty of terrorist activity [U]His spare-time activities (= things he enjoys doing) include cooking, tennis and windsurfing. [C usually plural]We offer our clients a wide range of outdoor/sporting/educational activities. [C usually plural]

Cambridge English vocab.      Кембриджский английский словарь.