One that amplifies, enlarges, or extends, An electronic device that is used to increase the magnitude of an electrical signal

An ampere, An amplifier, especially one used to amplify music

device for converting sound waves into electrical energy, A device (transducer) used to convert sound waves into a varying electric current; normally fed into an amplifier and either recorded or broadcast, An instrument that converts sound waves into an electric current, usually fed into an amplifier, a recorder, or a broadcast transmitter, verb_ transitive To put one or more microphones on or in

A panel of buttons used for typing and performing other functions on a computer or typewriter, Any of various instruments, played by means of a musical keyboard, often connected to a synthesizer or amplifier, device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like