noun, plural ac·tiv·i·ties.
- the number of atoms of a radioactive substance that disintegrate per unit of time, usually expressed in curies.
Origin of activity
Examples from the Web for activity
For me, I just like the activity, and the activity just happens to make money.The Gospel According to Nick Denton—What Next For The Gawker Founder?|Lloyd Grove|December 14, 2014|DAILY BEAST
Power generation and production is not the sort of activity one usually associates with skiing.
If a person looks like they are alive, but their brain shows no signs of activity, is this person dead or alive?
It is also overwhelmingly pro-regime, and since the start of Syrian unrest the region has become a hotbed of pro-Assad activity.
The play of Sunday, the play of being angels in the choir, is not just a peripheral secondary marginal realm of activity.
Thus one aims at, say, a rabbit; what he wants is to shoot straight: a certain kind of activity.Democracy and Education|John Dewey
Joshua's activity during the last years of his life forms an important part of the history of his times.History of the Jews, Vol. II (of 6)|Heinrich Graetz
But his activity at this period was directed to a different aim than that of the former one.Mystics and Saints of Islam|Claud Field
It is to ascertain the meaning of present activities and to secure, so far as possible, a present activity with a unified meaning.Human Nature and Conduct|John Dewey
Its activity was quite marvellous, and it was very playful and elegant in its motions.Natural History of the Mammalia of India and Ceylon|Robert A. Sterndale
noun plural -ties
- 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
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.