Activity may refer to: *

Action (philosophy) In philosophy, an action is something an Agency (philosophy), agent does. Actions contrast with events which merely happen to someone and are typically performed for a Goal, purpose and guided by an intention. The first question in the Action th ...

, in general * Human activity:

human behavior Human behavior is the potential and expressed capacity (Energy (psychological), mentally, Physical activity, physically, and Social action, socially) of human individuals or groups to respond to internal and external Stimulation, stimuli throu ...

, in sociology behavior may refer to all basic human actions, economics may study human economic activities and along with cybernetics and psychology may study their modulation * In Semantics, a type of

Aktionsart In linguistics, the lexical aspect, situation type or Aktionsart (, plural ''Aktionsarten'' ) of an event is part of the way in which that event is structured in relation to time. For example, the English verbs ''arrive'' and ''run'' differ in ...

Recreation Recreation is an activity of leisure, leisure being discretionary time. The "need to do something for recreation" is an essential element of human biology and psychology. Recreational activities are often done for happiness, enjoyment, amusement, ...

, or activities of leisure * The Aristotelian concept of energeia, Latinized as ''actus'' *

Activity (UML) An activity in Unified Modeling Language (UML) is a major task that must take place in order to fulfill an operation contract. The ''Student Guide to Object-Oriented Development'' defines an activity as a "sequence of activities that make up a pro ...

, a major task in Unified Modeling Language * ''Activity'', the rate of catalytic activity, such as enzyme activity (

enzyme assay Enzyme assays are laboratory methods for measuring enzymatic activity. They are vital for the study of enzyme kinetics and enzyme inhibition. Enzyme units The quantity or concentration of an enzyme can be expressed in molar amounts, as with a ...

), in physical chemistry and enzymology *

Thermodynamic activity In thermodynamics, activity (symbol ) is a measure of the "effective concentration" of a species in a mixture, in the sense that the species' chemical potential depends on the activity of a real solution in the same way that it would depend on conc ...

, the effective concentration of a solute for the purposes of mass action *

Activity (project management) In project management, a task is an activity that needs to be accomplished within a defined period of time or by a deadline to work towards work-related goals. It is a small, essential piece of a job that serves as a means to differentiate variou ...

* Activity, the number of radioactive decays per second *

Activity (software engineering) Activity diagrams are graphical representations of workflows of stepwise activities and actions with support for choice, iteration, and concurrency. In the Unified Modeling Language, activity diagrams are intended to model both computational an ...

Activity (soil mechanics) The Atterberg limits are a basic measure of the critical water contents of a fine-grained soil: its shrinkage limit, plastic limit, and liquid limit. Depending on its water content, soil may appear in one of four states: solid, semi-solid, plastic ...

* , an aircraft carrier of the Royal Navy * "Activity", a song by Way Out West from ''

Intensify ''Intensify'' is the second studio album by English electronic music duo Way Out West, released on 20 August 2001 by Distinct'ive Records. The album was marked by a move from the defunct Deconstruction Records label to Distinctive, and a chang ...

'' *

Cultural activities Culture ( ) is a concept that encompasses the social behavior, institutions, and norms found in human societies, as well as the knowledge, beliefs, arts, laws, customs, capabilities, attitudes, and habits of the individuals in these groups ...

, activities referred to culture.

See also