Essentials vs Non-Essentials

The essentials/non-essentials distinction comes from Objectivism. When you form a definition, some characteristics are essential — they are fundamental and explain or condition many of the thing’s other features — while others are incidental and follow from or merely accompany the essentials. A good definition names the essentials, not an arbitrary list of observable traits. This gives concepts economy and structure: one fundamental characteristic accounts for many derivative ones, so the definition compresses a large body of knowledge.

CF treats Objectivism’s grasp of essentials as a genuine strength and one of its better contributions to concept formation alongside measurement omission. But CF reads it through a Popperian lens, which creates a real tension. Popper criticized essentialism — the doctrine that words have fixed, intrinsic essences that definitions exist to capture, and that disputes are settled by pinning down “what X really is.” On the strict Popperian view, definitions run the wrong way: they should not be the foundation of knowledge, and chasing definitional precision often wastes effort.

CF’s resolution is to keep the practical sorting work (some features really are more fundamental and explanatory than others) while rejecting the claim that essentials are timeless metaphysical cores fixed in advance. Which characteristics count as essential is contextual and fallible — relative to a purpose and to current knowledge — and revisable under criticism as understanding improves. So CF endorses distinguishing essential from incidental for clarity and economy, but treats the resulting definitions as open-ended, improvable tools rather than final captures of a thing’s nature.