Multiword Expression¶
A conventional sequence of two or more lexemes whose meaning, syntax, selection, or use is partly idiosyncratic relative to ordinary composition.
Core Idea¶
Multiword expressions occupy the boundary between lexicon and grammar. Several written or spoken words recur as one conventional unit even though they retain separate lexical forms.
The relevant irregularity is not always an opaque idiomatic meaning. Restricted word choice, unusual syntax, pragmatic function, or statistically entrenched association can also establish unithood, so analyses must state their diagnostic and language context.
Scope of Application¶
- Lexicography. Records idioms, phrasemes, and collocations.
- Syntax and semantics. Studies partial compositionality and internal constraints.
- Corpus linguistics. Measures association and conventional recurrence.
- Natural-language processing. Recognizes units that affect parsing and translation.
Clarity¶
State the language, lexeme boundaries, expression type, proposed idiosyncrasy, variability, corpus or speaker evidence, and whether unithood is lexical, constructional, pragmatic, or task-specific. Inclusion test: Show at least two lexemes, conventional recurrence, and a supported lexical, semantic, syntactic, pragmatic, or distributional property not predicted by ordinary combination. Exclusion test: Exclude arbitrary adjacent words, ordinary productive compounds treated as single lexemes by the relevant analysis, and freely generated phrases whose properties follow from grammar and component meanings. Nearest boundary: A frequent collocation can qualify through restricted lexical choice even when its overall meaning is transparent; a merely frequent free phrase does not. Exit condition: The expression leaves the class when its behavior is fully explained as an unconstrained, one-off application of ordinary grammar and word meanings. Common misclassifications: It is not every sequence of adjacent words. It need not be completely fixed or semantically opaque. It is not established by frequency alone. Its tokenization and boundaries can vary across languages and analyses. Nearest named distinctions: Idiom: Usually emphasizes nonliteral or noncompositional meaning and is narrower. Collocation: Emphasizes conventional co-occurrence and may remain transparent. Compound word: May be analyzed as one lexeme despite multiple roots. Free phrase: Is generated predictably by grammar and component meanings.
Manages Complexity¶
The category preserves both internal word structure and unit-level behavior, avoiding a false choice between ordinary phrases and indivisible words.
Abstract Reasoning¶
- Segment the candidate into lexemes.
- Establish recurrence and conventionality.
- Test semantic and syntactic predictability.
- Map permitted variation and contextual readings.
- Apply a stated unithood criterion for the intended analysis.
Knowledge Transfer¶
MWE diagnostics transfer across languages only after remapping morphology, spacing, wordhood, idiomaticity, and corpus conventions.
Relationships to Other Abstractions¶
Current abstraction Multiword Expression Domain-specific
Parents (1) — more general patterns this builds on
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Multiword Expression presupposes Lexicalization Domain-specific
A Multiword Expression presupposes Lexicalization because its multi-lexeme sequence is stored or conventionalized beyond ordinary free composition.
Hierarchy path (1) — routes to 1 parentless root
- Multiword Expression → Lexicalization → Emergence → Micro Macro Linkage
Neighborhood in Abstraction Space¶
Multiword Expression sits in a crowded region of the domain-specific corpus (35th percentile for distinctiveness): several abstractions share nearly its structure, so a description that fits it tends to fit its neighbors too.
Family — Language Structure & Grammar Formalisms (23 abstractions)
Nearest neighbors
- Grammar — 0.89
- Formal Syntax — 0.88
- Structured Literacy — 0.88
- Bare Nouns — 0.88
- Productivity (linguistics) — 0.88
Computed from structural-signature embeddings · 2026-10-08