Definition of primary quality
: a quality (as bulk) that is inseparable from a physical object and is in it as in our perception of it these I call original or primary qualities of body, which I think we may observe to produce simple ideas in us, viz. solidity, extension, figure, motion or rest, and number — John Locke —contrasted with secondary quality
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up primary quality? Please tell us where you read or heard it (including the quote, if possible).