Longman Dictionary of Contemporary English homepage

activity

 noun
     
ac‧tiv‧i‧ty S1 W1 plural activities
1 [countable usually plural] something that you do because you enjoy it
leisure/recreation/outdoor/cultural etc activities
outdoor activities such as hiking or climbing
2 [uncountable and countable] things that people do in order to achieve a particular aim
political/economic/business etc activity
Everyone is free to engage in peaceful political activity.
fund-raising activities
3 [uncountable] a situation in which a lot of things are happening or a lot of things are being done:
the noise and activity of the city
There's an amazing level of activity in the town centre currently.
physical/mental activity
Regular physical activity helps to control your weight.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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