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What is a vocabulary?

A vocabulary, on SPLectrum’s working definition, is the set of concepts that label the relational they represent. Labels are what make a vocabulary visible as a vocabulary — they give differentiation something to persist through, something that can be picked up, compared, reused.

The static view

Vocabulary is the static view of the substance that language describes from the dynamic view. Language is concepts in relation, operating, producing. Vocabulary is the same concepts seen from the labels: what they name, how they are bounded, what they distinguish.

Same substance, complementary cuts. A vocabulary without relations is a word list — labels with nothing holding them together. Relations without labels have nothing to persist through — no way for differentiation to compound. The two views need each other, and neither is prior.

Labels are constitutive

The label is not a tag applied after the fact to something that already exists independently. Labelling is how differentiation persists long enough to become material for further differentiation. At P0, differentiation happens; the differentiated gets wrapped in labels; the labelled forms become available for the next round. This is the P4-into-P0 cycle — vocabularies carrying the plurality of what has been differentiated, feeding it back into the creative dynamic.

A vocabulary is not a snapshot of a language at rest. It is the constitutive moment where differentiation becomes durable.

What the definition leaves open

The working definition does not settle where the boundary of a vocabulary falls — how many concepts, how tightly related, how formal the labelling. Those distinctions belong to the types and to the individual entries in A–Z as they get populated. The definition gives the structural minimum: concepts, labels, the relational they represent. Everything else is discovered by working through the material.