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Amphetamine: Amphetamine is a central nervous system (CNS) stimulant marketed under the brand name Evekeo, among others. It is used in the treatment of attention deficit hyperactivity disorder (ADHD), narcolepsy, and obesity.
Amplifier: An amplifier, electronic amplifier or amp is an electronic device that can increase the power of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output.
Ampersand: The ampersand is the logogram &, representing the conjunction "and". It originated as a ligature of the letters et—Latin for "and".