# rectifier

> English word · Noun · IPA /ˈɹɛktɪfaɪɚ/ · frequency rank #52,589

## Definitions
1. Something that rectifies.
2. A device that converts alternating current into direct current; often a diode.
3. An instrument used for determining and rectifying the variations of the compass on board ship.
4. The activation function f(x)= max (0,x), where x is the input to a neuron.

## Etymology
From rectify + -er.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/rectifier