Lexicalist Hypothesis¶
A grammar hypothesis separating word-building from phrase syntax and restricting syntactic access to word-internal structure.
Core Idea¶
The lexicalist hypothesis posits a modular boundary between word formation and syntax: syntactic transformations cannot operate inside derivational words in the weak version, nor inside derivational or inflectional words in the strong version.
Syntax cannot transform inside a derivationally complex word but may interact with inflection. Both derivational and inflectional words are opaque to syntax.
Scope of Application¶
- Syntax. Tests transformation domains.
- Morphology. Models word formation.
- Grammar theory. Compares modular architectures.
- Typology. Evaluates cross-language diagnostics.
Clarity¶
Include grammatical theories asserting that syntax cannot manipulate word-internal derivational structure, with any stronger inflectional restriction stated. Exclude the lexical integrity hypothesis treated as the whole theory, morphology–syntax interfaces that allow distributed word building, and ordinary dictionary lexicons. Inclusion test: Include grammatical theories asserting that syntax cannot manipulate word-internal derivational structure, with any stronger inflectional restriction stated. Exclusion test: Exclude the lexical integrity hypothesis treated as the whole theory, morphology–syntax interfaces that allow distributed word building, and ordinary dictionary lexicons. Nearest boundary: Distributed Morphology is a major alternative because syntactic structure participates in word formation. Exit condition: The hypothesis fails where validated syntactic operations access the prohibited word-internal domain. Common misclassifications: It is not a dictionary claim. It is not only lexical integrity. It is not Distributed Morphology. It is not identical in weak and strong forms. Nearest named distinctions: Lexical integrity: A narrower opacity constraint. Distributed Morphology: Builds words through syntactic structures. Lexical semantics: Studies word meaning. Strong lexicalism: One version of the hypothesis.
Manages Complexity¶
A clean boundary explains opacity while mixed phenomena pressure it. The versions differ over inflectional accessibility.
Abstract Reasoning¶
- Lexicon/word module — Builds complex words. If syntax freely builds words, lexicalism fails.
- Syntax module — Combines words into phrases. Collapsing modules removes the boundary.
- Word integrity — Blocks syntactic operations inside words. Internal access is the central counterexample type.
- Derivation — Falls outside transformations in weak lexicalism. Allowing it violates the weak claim.
- Inflection — Also becomes inaccessible in strong lexicalism. Weak and strong must not be conflated.
- Empirical diagnostics — Test movement, insertion, and interpretation. Labels alone do not establish modularity.
Knowledge Transfer¶
Module-boundary analysis transfers among grammar theories only after wordhood, derivation, inflection, and syntactic accessibility are independently defined; one language's diagnostics cannot settle the universal claim.
Relationships to Other Abstractions¶
Current abstraction Lexicalist Hypothesis Domain-specific
Parents (1) — more general patterns this builds on
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Lexicalist Hypothesis presupposes Modularity Prime
Lexicalist Hypothesis presupposes Modularity because it separates word formation into a module whose internal structure is restricted from syntax.
Hierarchy path (1) — routes to 1 parentless root
- Lexicalist Hypothesis → Modularity → Decomposition
Neighborhood in Abstraction Space¶
Lexicalist Hypothesis sits in a moderately populated region (44th percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.
Family — Language Structure & Grammar Formalisms (23 abstractions)
Nearest neighbors
- Lexical Hypothesis — 0.87
- Organic unity — 0.87
- Bare Nouns — 0.87
- Productivity (linguistics) — 0.86
- Quotient of a Formal Language — 0.86
Computed from structural-signature embeddings · 2026-10-08