any of the qualities inherent in an object, namely quantity, extent, figure, solidity, and motion or rest.
Compare secondary quality.
Origin of primary quality
First recorded in 1650–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(in empiricist philosophy) those properties of objects that are directly known by experience, such as size, shape, and number
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012