The Categories

In this classic philosophical treatise, Aristotle investigates how language and reality intertwine, laying out a systematic framework for understanding the ways we name and think about the world. He begins by distinguishing between equivocal terms—words that share a name but differ in meaning—and univocal terms, whose definition stays constant across every usage. The discussion quickly moves to the subtle relationship between what can be predicated of a subject and what is merely present within it, setting the stage for a deeper inquiry into the nature of substance.

Through clear examples ranging from simple nouns like “man” and “horse” to more complex expressions of quantity, quality, and relation, the work maps out the ten categories that have shaped logical analysis for centuries. Readers will encounter the distinction between primary substances, which exist independently, and secondary substances, which serve as broader classes containing those particulars. The result is a concise yet profound guide that invites listeners to reflect on how we structure thought, making it an essential foundation for anyone curious about philosophy, language, or critical reasoning.