activity

noun

measure of the effective concentration of a species in a mixture
event; actions that result in changes of state
movement of people or animals
participating in, live, in use

Wiktionary

Pronunciation: /ækˈtɪv.ɪ.ti/ / /ækˈtɪv.ə.ti/ / [ækˈtɪv.ə.ɾi]

noun

Etymology: Etymology tree Proto-Indo-European *h₂eǵ- Proto-Indo-European *-eti Proto-Indo-European *h₂éǵeti Proto-Italic *agō Latin agō Proto-Indo-European *-wós Proto-Indo-European *-iHwósder. Latin -īvus ▲ Ancient Greek ἐνεργητῐκός (energētĭkós)sl. Latin āctīvus Proto-Indo-European *-teh₂ Proto-Indo-European *-ts Proto-Indo-European *-teh₂ts Proto-Italic *-tāts Latin -tās Latin āctīvitāsder. Middle French activitébor. English activity From Middle French activité, from Latin activitas. Equivalent to active + -ity.

The state or quality of being active; activeness.
“Pit row was abuzz with activity.”
“For quotations using this term, see Citations:activity.”
Something done as an action or a movement.
“The activity for the morning was a walk to the store.”
Something done for pleasure or entertainment, especially one involving movement or an excursion.
“An increasing number of sports activities are on offer at the university.”
“Quilting can be an enjoyable activity.”
The lexical aspect (aktionsart) of verbs or predicates that change over time and have no natural end point.
“[…]distinctions among states of affairs are reflected to a striking degree in distinctions among Aktionsart types. That is, situations are expressed by state verbs or predicates, events by achievement verbs or predicates, and actions by activity verbs or predicates.”
The number of radioactive decays per unit time. Unit for it: becquerel or curie
The property of substances to react with other substances