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WordReference Random House Learner's Dictionary of American English © 2024ac•tiv•i•ty /ækˈtɪvɪti/USA pronunciation n., pl. -ties. - [uncountable] the state or quality of being active or lively.
- a specific deed, action, or function:[countable]social activities.
WordReference Random House Unabridged Dictionary of American English © 2024ac•tiv•i•ty (ak tiv′i tē),USA pronunciation n., pl. -ties. - the state or quality of being active:There was not much activity in the stock market today. He doesn't have enough physical activity in his life.
- a specific deed, action, function, or sphere of action:social activities.
- work, esp. in elementary grades at school, that involves direct experience by the student rather than textbook study.
- energetic activity;
animation;
liveliness. - a use of energy or force;
an active movement or operation. - normal mental or bodily power, function, or process.
- Chemistry[Physical Chem.]the capacity of a substance to react, corrected for the loss of reactivity due to the interaction of its constituents.
- Physics
- the number of atoms of a radioactive substance that disintegrate per unit of time, usually expressed in curies.
- radioactivity.
- an organizational unit or the function it performs.
- Medieval Latin āctīvitās. See active, -ity
- Middle French)
- (1520–30
Collins Concise English Dictionary © HarperCollins Publishers:: activity /ækˈtɪvɪtɪ/ n ( pl -ties)- the state or quality of being active
- lively action or movement
- any specific deed, action, pursuit, etc: recreational activities
- the number of disintegrations of a radioactive substance in a given unit of time, usually expressed in curies or disintegrations per second
- the capacity of a substance to undergo chemical change
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