Explanation
Compositionality is the principle that the meaning of a complex expression arises from the meanings of its parts and the way those parts are combined. It does not promise that understanding is mechanical or context-free. Instead, it frames an analytical test: what does each component contribute, what operation is performed by the structure, and what additional assumptions are required? Idioms, metaphors, indexicals, and pragmatic enrichment are therefore not simply counterexamples; they mark different limits or extensions of a compositional account. The explanatory gain lies in separating what grammar computes, what the lexicon stores, and what context supplies.
Movement of thought
1. The complex expression is divided into linguistically motivated constituents and structural relations. 2. Each constituent is assigned a stable or context-dependent semantic contribution. 3. A combination rule reconstructs how those contributions yield the overall interpretation. 4. Divergent readings are tested for idiomaticity, ambiguity, or pragmatic enrichment. 5. The account states precisely which content is computed and which is additionally inferred.
Scientific use case
Formal semantics, computational linguistics, and philosophy of language formulate explicit composition rules and test them on ambiguity, quantification, and context dependence. Corpus and experimental evidence indicate when stored units or pragmatic processes are required.
Example
Readers encounter a novel phrase whose words and syntactic construction they know. They can compute a basic meaning but must infer from the conversational purpose whether the phrase is literal, ironic, or metaphorical.
Counterexample
The mere fact that a sentence is understood does not provide a compositional explanation. If the proposed rule predicts different results for parallel structures or inserts decisive meaning only after the fact, the analysis is inadequate.
Distinction
Distinguish compositionality from simple addition, since structure and mode of combination are essential. It is also not equivalent to complete context-independence or semantic transparency; context-sensitive contributions can be composed.
Effect on thought and perception
Compositionality enables finite resources to interpret indefinitely many novel expressions. It creates expectations of systematic meaning without excluding creative or context-sensitive interpretation.
Resonance
Parts retain their voice while being transformed by connection. The whole arises neither independently of them nor as their mere sum, but through a rule-governed relationship.
Cite this entry
Reich, Michael (Hrsg./ed.): „Compositionality“. Atlas der Sprache, AT-133-012. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-133-012The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.
Historical background
The Cours argues that a complex expression’s parts and its whole acquire value through their relation. Its example of a derived formation is not presented as a mere pile of independent meanings. This is historically relevant to the problem addressed by compositionality, but it should not be mistaken for the later formal principle that specifies how a complex meaning depends on constituent meanings and their mode of combination. The Atlas can use the comparison to ask which contribution comes from each part and which constraints are supplied by the construction. An original countertest compares a productive formation with a conventional expression whose interpretation cannot be predicted so simply. The French passage provides a neighbouring relational analysis, while the exact English label and formal semantic tradition require separate historical sources.
How conceptual history changes the analysis
Compositionality requires an explicit relation among constituent meanings, structure, and whole meaning; Saussure’s reciprocal value account is a predecessor, not the formal principle itself.
References for the historical section
- Ferdinand de Saussure, Cours de linguistique générale (1916), edited by Bally and Sechehaye with Riedlinger; 1971 Payot printing, Wikisource transcription · Part II, VI §1: the relation of whole and parts in désir-eux
Selected passage, not a complete genealogy or an English first-attestation claim. Original Atlas applications are editorial interpretations, not reported experiments. The Cours is a posthumous editorial reconstruction; French technical vocabulary is not an English attestation. Its historical phonology and classifications are not automatically current consensus.