# res cogitans

> English word · Noun

## Definitions
1. A nonphysical substance of which minds are composed, separate from res extensa, according to Cartesian dualism and idealism.

## Etymology
From Latin rēs cōgitāns.

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