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activity

[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.
Origin
1520-1530
1520-30; (< Middle French) < Medieval Latin āctīvitās. See active, -ity
Related forms
nonactivity, noun, plural nonactivities.
preactivity, noun, plural preactivities.
superactivity, noun, plural superactivities.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for activities
  • Participation in service activities is also required.
  • It uses this information to create a database of backgrounds, events, objects and activities.
  • Get ideas here for activities and displays to enhance visitors' experiences.
  • activities offered may require individual reservations and are based upon availability.
  • The junta has placed such strict limits on her activities that she has in effect simply been released into a larger prison.
  • Find multimedia activities aligned with national standards, educational projects, and more.
  • We feature hands-on activities for kids of all ages.
  • Essential first stop for maps, advice, and guided hikes and other activities.
  • activities that amount to nondeductible personal uses at home may be seen as business activities while on sabbatical.
  • Tomorrow, perhaps, countries could be responsible only for the local activities of any global firm active in their territory.
British Dictionary definitions for activities

activity

/ækˈtɪvɪtɪ/
noun (pl) -ties
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, λB, is defined as exp (μBRT) where μB 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
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Word Origin and History for activities
n.

in schoolwork sense, 1923, American English, from activity.

activity

n.

c.1400, "active or secular life," from Old French activité, from Medieval Latin activitatem (nominative activitas), a word in Scholastic philosophy, from Latin activus (see active). Meaning "state of being active, briskness, liveliness" recorded from 1520s; that of "capacity for acting on matter" is from 1540s.

Online Etymology Dictionary, © 2010 Douglas Harper
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activities in Medicine

activity ac·tiv·i·ty (āk-tĭv'ĭ-tē)
n.

  1. A physiological process.

  2. The presence of neurogenic electrical energy in electroencephalography..

  3. An ideal concentration for which the law of mass action will apply perfectly.

  4. The intensity of a radioactive source.

  5. 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.
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15
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