amplifier

noun

am·​pli·​fi·​er ˈam-plə-ˌfī(-ə)r 

: one that amplifies

specifically : an electronic device (as in a stereo system) for amplifying voltage, current, or power

Examples of amplifier in a Sentence

He plugged his electric guitar into an amplifier.

Recent Examples on the Web

The excitement filled the room as the spotlight focused on the stage, which featured a complete drum set, several amplifiers, microphones, a keyboard, and a synthesizer. —Laura Sirikul, Forbes.com, 19 Apr. 2025

With a nominal impedance of 4 ohms and sensitivity of 89 dB, high-power, high-current, solid-state amplifiers will bring out the very best in these speakers. —Robert Ross, Robb Report, 26 Mar. 2025

The Pendulum’s power supply circuitry is of the same standard expected of a D’Agostino amplifier. —Mark Sparrow, Forbes.com, 2 Apr. 2025

The headphone amplifier has a user-selectable gain setting. —Mark Sparrow, Forbes, 6 Mar. 2025

Word History

Etymology

amplify + -er entry 2

First Known Use

1546, in the meaning defined above

Phrases Containing amplifier

• amplifier host

Rhymes for amplifier

• clarifier
• classifier
• gasifier
• magnifier
• modifier
• multiplier
• occupier
• pacifier
• purifier
• qualifier
• quantifier
• rectifier

Kids Definition

amplifier

noun

am·​pli·​fi·​er ˈam-plə-ˌfī(-ə)r 

: one that amplifies

especially : a device usually using electron tubes or transistors to obtain an increase of voltage, current, or power

Medical Definition

amplifier

noun

am·​pli·​fi·​er ˈam-plə-ˌfī(ə)r 

: one that amplifies

specifically : an electronic device (as in a computer or sound-reproducing system) for amplifying voltage, current, or power