an electronic device used to increase the strength of the signal fed into it an additional lens for altering the focal length of a camera lens a person or thing that amplifies
WordReference Random House Learner's Dictionary of American English © 2025
am•pli•fi•er /ˈæmpləˌfaɪɚ/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2025- an electronic device that amplifies sound, current, voltage, etc.
am•pli•fi•er
(am′plə fī′ər),USA pronunciation n.
- a person or thing that amplifies or enlarges.
- Electronics, Sound Reproductionan electronic component or circuit for amplifying power, current, or voltage.
- amplify + -er1 1540–50
Collins Concise English Dictionary © HarperCollins Publishers::
'amplifier' also found in these entries (note: many are not synonyms or translations):
amp
- amplification
- amplify
- audio
- balance
- booster
- bullhorn
- clipping
- crystal set
- cyclic AMP
- drive
- dynamic headroom
- electric
- fidelity
- gain
- go
- grille
- hearing aid
- high fidelity
- hum
- linear
- load
- loud-hailer
- magnetic amplifier
- music centre
- operational amplifier
- parametric amplifier
- paraphase amplifier
- power
- power amplifier
- preamplifier
- push-pull
- radio frequency
- regeneration
- reproduction
- scintillation counter
- servo
- shot effect
- stage
- state of the art
- tape deck
- tone control
- treble
- video