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:
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.
noun (pl) -ties
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, λB, is defined as exp (μBRT) where μB is the chemical potential
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.
activity ac·tiv·i·ty (āk-tĭv’ĭ-tē)
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.
to make ; activate.
a short, realistic play, usually in Spanish, that dramatizes the social and economic problems of Chicanos. Historical Examples acto continuo dispusironle una frugal colacin, y sentse con su hija la mesa. Legends, Tales and Poems Gustavo Adolfo Becquer A law was passed which interpreted the acto Addicional so as nearly to destroy provincial autonomy. The […]
a complex protein, consisting of and , that is the major constituent of skeletal muscle and is thought to interact with ATP to cause muscle contraction. noun a complex protein in skeletal muscle that is formed by actin and myosin and which, when stimulated, shortens to cause muscle contraction actomyosin ac·to·my·o·sin (āk’tə-mī’ə-sĭn) n. A protein […]
a quilted garment worn under mail in the 13th and 14th centuries; gambeson. Lord (John Emerich Edward Dalberg-Acton, 1st Baron) 1834–1902, English historian. a former municipal borough in SE England, now part of the London borough of Ealing: center of Puritanism at the time of Cromwell. a city in NE Massachusetts. Contemporary Examples acton had […]