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

Installation typically involves an outside antenna to capture the signal, an amplifier to boost it and an inside antenna to rebroadcast it inside your van. —Kurt Knutsson, FOXNews.com, 24 Sep. 2025

Her shop also carries products for preventing hearing loss, like custom headphones to make music or movies safer for your ears, to TV and phone amplifiers to help with comprehension and ultimately, quality of life for folks with hearing aids as well as products and counseling for tinnitus. —Shawn Price, Oc Register, 19 Sep. 2025

This will have the receiver (or amplifier) and the speakers bundled together in one purchase. —Bestreviews, Mercury News, 19 Sep. 2025

Anyone with a transmitter tuned to the right frequency and a powerful-enough amplifier can overwhelm faint GPS signals originating 12,000 miles above the Earth. —Paul Smith-Goodson, Forbes.com, 18 Sep. 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