# that is to say

> English word · Adverb

## Definitions
1. In other words. Used to introduce a clarification, simplification, or explanation

## Etymology
Calque of French c'est-à-dire.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/that-is-to-say