activity

[ ak-tiv-i-tee ]
/ ækˈtɪv ɪ ti /
SEE SYNONYMS FOR activity ON THESAURUS.COM

noun, plural ac·tiv·i·ties.

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Origin of activity

1520–30; (< Middle French) < Medieval Latin āctīvitās. See active, -ity

OTHER WORDS FROM activity

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.

Words nearby activity

activewear, active‐matrix, activin, activism, activist, activity, activize, acto, actomyosin, acton, actor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Content related to activity

Dictionary.com’s Winter Break Word Challenges For KidsIt may be freezing outside, but you can keep your kids' minds active and energized with these fun winter word challenges.
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Words related to activity

action, life, enterprise, exercise, movement, task, work, project, job, venture, act, endeavor, scheme, exertion, motion, labor, liveliness, animation, bustle, hustle

Example sentences from the Web for activity

British Dictionary definitions for activity

activity
/ (ækˈtɪvɪtɪ) /

noun plural -ties

the state or quality of being active
lively action or movement
any specific deed, action, pursuit, etcrecreational activities
the number of disintegrations of a radioactive substance in a given unit of time, usually expressed in curies or disintegrations per second
  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
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

Medical definitions for activity

activity
[ ăk-tĭv′ĭ-tē ]

n.

A physiological process.
The presence of neurogenic electrical energy in electroencephalography.
An ideal concentration for which the law of mass action will apply perfectly.
The intensity of a radioactive source.
The ability to take part in a chemical reaction.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.