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

In what’s known as a differential amplification process, an amplifier takes in signals from all three electrodes but ignores signals that appear in both the reference and the measuring electrodes, and only amplifies the signal that represents the difference between the two measuring electrodes. —IEEE Spectrum, 3 Feb. 2025

The intrigue: Now ask those same questions at tens of thousands of businesses, thousands of times every day, selling everything from TVs to tires and avocados to amplifiers. —Ben Berkowitz, Axios, 3 Feb. 2025

This segment provides signal chain products that sense, condition, and measure signals to allow information to be transferred or converted for further processing and control, including amplifiers, data converters, interface products, motor drives, clocks, and logic and sensing products. —Adam Sarhan, Forbes, 23 Jan. 2025

For people who have problems speaking, there are devices such as text-to-speech apps or voice amplifiers. —Emily Kay Votruba, EverydayHealth.com, 31 Jan. 2025

Word History

Etymology

amplify + -er entry 2

First Known Use

1546, in the meaning defined above

Phrases Containing amplifier

• amplifier host

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