activity

[ak-tiv-i-tee]

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.

activity

/ 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

Other Word Forms

• nonactivity noun
• preactivity noun
• superactivity noun

Word History and Origins

Origin of activity¹

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

Example Sentences

“It’s a little more favorable for us to be able to work on the fire and have a little less chance for volatile fire activity,” said Sam Wu, a spokesperson for the Garnet fire.

From Los Angeles Times

Judge James G. Bertoli, who retires in January, was publicly admonished by a judicial conduct commission for improper political activity and social media conduct.

From Los Angeles Times

This seemed part of a wider argument that Reform should ramp up its campaigning activities and be prepared for all eventualities.

From BBC

Heritage crime refers to any illegal activity that harms historical assets.

From BBC

Knight, of The Crescent, Bolton-upon-Dearne, was handed a 20-month sentence suspended for two years along with 50 sessions of rehabilitation activity and must return to court for periodic reviews by the judge.

From BBC

Related Words

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