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Activity may mean:
action , in general
physical activity
Activity , an alternative name for the game charades
Activity , a task .
Activity , the ability of a piece to influence the game in chess
Activity , the rate of a catalytic reaction, such as enzyme activity , in physical chemistry and enzymology
activity (chemistry) , the effective concentration of a solute for the purposes of mass action
activity (project management)
activity (radioactivity) , the number of radioactive decays per second
activity (software engineering)
activity (soil mechanics)
activity diagram , a diagram representing activities in UML
HMS Activity , an aircraft carrier of the Royal Navy
Activity, a board game by Piatnik