Definition of "power user" [power user]

• A person who makes heavy use of computers, running many applications and doing complex work (as opposed to an ordinary user who tends to just run one application at a time and do simple work). (noun)
• A user of a personal computer who can utilize advanced and complex functions and programs which are outside the reach of normal users (noun)
• A computer user who seeks and uses products having the most features and the fastest performance. (noun)

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