# RER

> English word · Noun · frequency rank #58,975

## Definitions
1. A type of railway system that generally runs from suburbs or satellite towns into a city centre, with a central tunnel or overground corridor with higher speeds and more widely spread stations than a subway or metro.

## Etymology
From French RER, often reinterpreted as "Regional Express Rail".

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