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Activity may mean:

• action, generally
• activity (chemistry), the effective concentration of a solute for the purposes of mass action
• activity (radioactivity), the number of disintegrations per second
• activity (project management),
• activity (software engineering).
• in chess, the ability of a piece to influence the game
• the HMS Activity an aircraft carrier of the Royal Navy
• in physical chemistry and enzymology, the rate of a catalytic reaction such as enzyme activity

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