activity Definition in Cambridge British English Dictionary
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Definition of "activity" - British English Dictionary

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activitynoun

uk   /ækˈtɪv.ɪ.ti/  us   /-ə.t̬i/

activity noun (MOVEMENT)

B2 [U] the situation in which a lot of things are happening or people are moving around: There was a lot of activity in preparation for the Queen's visit. Economists are concerned by the low level of economic activity. There was a sudden flurry of activity when the director walked in.
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activity noun (WORK)

B2 [C or U] the work of a group or organization to achieve an aim: He was found guilty of terrorist activity. criminal activities
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activity noun (ENJOYMENT)

A2 [C usually plural] something that is done for enjoyment, especially an organized event: His spare-time activities include cooking, tennis, and windsurfing. We offer our guests a wide range of outdoor/sporting activities.
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(Definition of activity from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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