# tonus

> English word · Noun

## Definitions
1. tonicity; tone
2. A tonal system or mode used in Gregorian chant.

## Etymology
Borrowed from Latin tonus (“strain, tension”). Doublet of tone, tune, and ton (fashion/style).

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