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Lexicalist Hypothesis

A grammar hypothesis separating word-building from phrase syntax and restricting syntactic access to word-internal structure.

Version
v1 · 2026-09-28 · History
Domain-specific #
10391
Domain group
Humanities
Origin domain
Linguistics & Semiotics
Subdomains
Generative Grammar, Morphology, Syntax → Linguistics & Semiotics
Aliases
Lexicalism, Lexicalist Architecture

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.

Structural Signature

Sig role-phrases:

  • Lexicon/word module — Builds complex words. It is module. Counterfactual: If syntax freely builds words, lexicalism fails.
  • Syntax module — Combines words into phrases. It is module. Counterfactual: Collapsing modules removes the boundary.
  • Word integrity — Blocks syntactic operations inside words. It is constraint. Counterfactual: Internal access is the central counterexample type.
  • Derivation — Falls outside transformations in weak lexicalism. It is domain. Counterfactual: Allowing it violates the weak claim.
  • Inflection — Also becomes inaccessible in strong lexicalism. It is version. Counterfactual: Weak and strong must not be conflated.
  • Empirical diagnostics — Test movement, insertion, and interpretation. It is evidence. Counterfactual: Labels alone do not establish modularity.

What It Is Not

  • 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.
  • Closest near-miss. Distributed Morphology is a major alternative because syntactic structure participates in word formation.

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.

Manages Complexity

A clean boundary explains opacity while mixed phenomena pressure it. The versions differ over inflectional accessibility.

Abstract Reasoning

  1. Lexicon/word module — Builds complex words. If syntax freely builds words, lexicalism fails.
  2. Syntax module — Combines words into phrases. Collapsing modules removes the boundary.
  3. Word integrity — Blocks syntactic operations inside words. Internal access is the central counterexample type.
  4. Derivation — Falls outside transformations in weak lexicalism. Allowing it violates the weak claim.
  5. Inflection — Also becomes inaccessible in strong lexicalism. Weak and strong must not be conflated.
  6. 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.

Examples

Applied / In Practice

Syntax cannot transform inside a derivationally complex word but may interact with inflection.

Mapped back: version → weak.

Applied / In Practice

Both derivational and inflectional words are opaque to syntax.

Mapped back: version → strong.

Structural Tensions

T1 — Modular Simplicity versus Interface Evidence. A clean boundary explains opacity while mixed phenomena pressure it.

Diagnostic: Which diagnostics are decisive?

T2 — Weak versus Strong. The versions differ over inflectional accessibility.

Diagnostic: Which claim is tested?

Structural–Framed Character

Builds complex words. Combines words into phrases. A clean boundary explains opacity while mixed phenomena pressure it.

Structural Core vs. Domain Accent

Also becomes inaccessible in strong lexicalism. Test movement, insertion, and interpretation. The hypothesis fails where validated syntactic operations access the prohibited word-internal domain.

This entry presupposes Modularity.

  • Approved root. The frozen graph retains lexicalist hypothesis without a parent edge.

  • Related — Lexical integrity and Distributed Morphology. A narrower opacity constraint. Builds words through syntactic structures.

Relationships to Other Abstractions

Local relationship map for Lexicalist HypothesisParents appear above the current abstraction, mutual partners to the right, and children below. Node labels state whether each abstraction is prime or domain-specific; colors identify relation types.Lexicalist HypothesisDOMAINPrime abstraction: Modularity — presupposesModularityPRIME

Current abstraction Lexicalist Hypothesis Domain-specific

Parents (1) — more general patterns this builds on

  • 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

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

Computed from structural-signature embeddings · 2026-10-08

Not to Be Confused With

  • Lexical integrity. Tell: A narrower opacity constraint.
  • Distributed Morphology. Tell: Builds words through syntactic structures.
  • Lexical semantics. Tell: Studies word meaning.
  • Strong lexicalism. Tell: One version of the hypothesis.

References

  • Frozen Wikipedia discovery revision: https://en.wikipedia.org/wiki/Lexicalist_hypothesis (revision 1346610649).
  • Preserved source candidate: https://muse.jhu.edu/article/688300
  • Preserved source candidate: https://www.jstor.org/stable/42945113
  • Preserved source candidate: https://oxford.universitypressscholarship.com/view/10.1093/acprof:oso/9780199267286.001.0001/acprof-9780199267286

The frozen Wikipedia revision is discovery provenance. The retained source set was reviewed for identity, formal or operational relation, and scope. The encyclopedia's structural synthesis is bounded to those claims; a thin authority surface is recorded as a nonblocking source-strengthening repair rather than concealed.