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, especially 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.
Physical Chemistry. the capacity of a substance to react, corrected for the loss of reactivity due to the interaction of its constituents.
the number of atoms of a radioactive substance that disintegrate per unit of time, usually expressed in curies.
an organizational unit or the function it performs.
- non·ac·tiv·i·ty, noun, plural non·ac·tiv·i·ties.
- pre·ac·tiv·i·ty, noun, plural pre·ac·tiv·i·ties.
- su·per·ac·tiv·i·ty, noun, plural su·per·ac·tiv·i·ties.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use activity in a sentence
What I discovered about sunflower seeds then, and continue to love about them now, is that, as with many worthwhile things, they are about the process, as much an activity as a food.Sunflower Seeds Are the Best Snack for the Anxious Mind | Emma Alpern | September 17, 2020 | Eater
This helped confirm economic activity in the third-quarter has greatly surprised to the upside.Global stocks tumble as the Fed’s ‘near-zero’ rates pledge leaves investors unsatisfied | Bernhard Warner | September 17, 2020 | Fortune
For participating in activities like swimming and yoga and completing health screenings and immunizations, users can earn a maximum of around $280 over the program’s two-year run.One country is now paying citizens to exercise with their Apple Watch | Naomi Xu Elegant | September 16, 2020 | Fortune
Noonan said his wife, a hairstylist, monitors the online activity of their daughters more closely than he does, and that their work is often a topic of conversation when the family convenes in the evening.Pro-Trump youth group enlists teens in secretive campaign likened to a ‘troll farm,’ prompting rebuke by Facebook and Twitter | Isaac Stanley-Becker | September 15, 2020 | Washington Post
He has also resisted changing the computer models, they said, including adding new types of data that’s standard at other firms such as tracking oil tankers and credit card activity.The losses continue to pile up for hedge fund king Ray Dalio | Bernhard Warner | September 15, 2020 | Fortune
The most recent activity had a high point of 3.6 on the Richter Scale.26 Earthquakes Later, Fracking’s Smoking Gun Is in Texas | James Joiner | January 7, 2015 | THE DAILY BEAST
“There is nothing whatsoever in the video which supports the charges—it shows no criminal activity,” Bakir said.Sisi Is Persecuting, Prosecuting, and Publicly Shaming Egypt’s Gays | Bel Trew | December 30, 2014 | THE DAILY BEAST
The masterpiece is huge, but structurally flawed and terribly vulnerable to seismic activity.
Moreover, trucks, dust, and boomtown stress are the effects of any large-scale industrial activity.
Some of them, including Kurnosova, escaped the country as they faced a possible jail term for their opposition activity.
Other factors being equal, the amount of urea indicates the activity of metabolism.A Manual of Clinical Diagnosis | James Campbell Todd
In disease, the amount of solids depends mainly upon the activity of metabolism and the ability of the kidneys to excrete.A Manual of Clinical Diagnosis | James Campbell Todd
No young Cave Swallows were taken and gonads of adults were in various stages of reproductive activity.Summer Birds From the Yucatan Peninsula | Erwin E. Klaas
It is the will directing the activity of the intellect into some particular channel and keeping it there.Assimilative Memory | Marcus Dwight Larrowe (AKA Prof. A. Loisette)
Both animal and man seemed to be dozing, but they woke into activity when the sahib approached.The Red Year | Louis Tracy
British Dictionary definitions for activity
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
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012