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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 "active" (see active). Meaning "state of being active, briskness, liveliness" recorded from 1520s; that of "capacity for acting on matter" is from 1540s. As "an educational exercise," 1923.

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Definitions of activity from WordNet

activity (n.)
any specific behavior;
they avoided all recreational activity
activity (n.)
the state of being active;
his sphere of activity
Synonyms: action / activeness
activity (n.)
an organic process that takes place in the body;
respiratory activity
Synonyms: bodily process / body process / bodily function
activity (n.)
(chemistry) the capacity of a substance to take part in a chemical reaction;
catalytic activity
activity (n.)
a process existing in or produced by nature (rather than by the intent of human beings);
volcanic activity
Synonyms: natural process / natural action / action
activity (n.)
the trait of being active; moving or acting rapidly and energetically;
the level of activity declines with age
Synonyms: activeness
From wordnet.princeton.edu