Definitions

1. noun

a fundamental substance or material, especially in philosophy, particularly in the context of Aristotle’s concept of hyle (matter) and the four elements.

“The ancient Greek philosopher believed in the existence of four fundamental substantiae that composed the universe.”

2. noun

a fundamental or essential substance or element, especially in a philosophical or scientific context.

“The discovery of new particles led scientists to re-examine their understanding of the fundamental substantiae that make up the universe.”