activity

American  

[ak-tiv-i-tee] / ækˈtɪv ɪ ti /

noun

plural

activities

1. 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.

2. a specific deed, action, function, or sphere of action.

   social activities.

3. work, especially in elementary grades at school, that involves direct experience by the student rather than textbook study.

4. energetic activity; animation; liveliness.

5. a use of energy or force; an active movement or operation.

6. normal mental or bodily power, function, or process.

7. Physical Chemistry. the capacity of a substance to react, corrected for the loss of reactivity due to the interaction of its constituents.

8. Physics.

   1. the number of atoms of a radioactive substance that disintegrate per unit of time, usually expressed in curies.

   2. radioactivity.

9. an organizational unit or the function it performs.

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activity British  

/ ækˈtɪvɪtɪ /

noun

1. the state or quality of being active

2. lively action or movement

3. any specific deed, action, pursuit, etc

   recreational activities

4. the number of disintegrations of a radioactive substance in a given unit of time, usually expressed in curies or disintegrations per second

5. 1. the capacity of a substance to undergo chemical change

   2. the effective concentration of a substance in a chemical system. The absolute activity of a substance B, λ B , is defined as exp (μ B RT ) where μ B is the chemical potential

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Other Word Forms

• nonactivity noun
• preactivity noun
• superactivity noun

Etymology

Origin of activity

First recorded in 1520–30; from Middle French or directly from Medieval Latin āctīvitās; active, -ity

Example Sentences

As the light show unfolded, the lantern's blindingly bright facades concealed a flurry of activity behind, as teams of people turned large metal barrels called rotors by hand to produce a kaleidoscopic effect.

From Barron's

In the memo, Chew told employees that the JV would operate with authority over data protection, content moderation and manage commercial activities, according to Bloomberg.

From MarketWatch

His fortunes unraveled not long after when investigators witnessed him on his property engaging in “heavy physical activity,” according to the Sacramento County D.A.’s office.

From Los Angeles Times

The bishops' letter comes as churches grapple with how to respond to immigration activity that affects their members.

From BBC

When the state Justices originally denied the unemployment tax exemption to a diocesan Catholic Charities Bureau and its associated groups, the 4-3 majority called their activities “secular in nature.”

From The Wall Street Journal

Related Words

• act
• endeavor
• enterprise
• job
• project
• scheme
• task
• venture
• work