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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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British Dictionary definitions for pre activity

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 pre activity
activity
1540s, "state of being active," from Fr. activité, from M.L. activitatem (nom. activitas), a word in Scholastic philosophy, from L. activus (see active). Meaning "state of being active, briskness, liveliness" recorded from 1520s. Activities in schoolwork sense is from 1923, Amer. Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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pre activity 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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