Explanation
Extension concerns what an expression applies to within a specified evaluation framework. For a one-place predicate, it can be represented as a set of objects. Membership may change with time or the world considered without automatically constituting semantic change. Other expression types receive different formal denotations. In hyponymy, the relevant issue is set inclusion; semantic broadening instead concerns change in linguistic use over time. These questions require different evidence.
Movement of thought
1. Specify expression type and evaluation framework. 2. Identify the applicable objects. 3. Distinguish extension from mode of meaning. 4. Separate synchronic set relations from historical change.
Scientific use case
A formal semantic analysis could assign extensions in a finite model and test inclusion between two predicate extensions.
Example
In an invented inventory containing two lamps and three chairs, lamp has the two lamps in its extension. Buying a third enlarges that set without necessarily changing the word’s meaning.
Counterexample
Two expressions may apply to the same objects in a model while still differing in meaning.
Distinction
Distinguish intension, connotation and historical semantic broadening. Denotation depends on expression type; a predicate’s set is one important case.
Effect on thought and perception
The concept specifies which objects a claim concerns within the chosen framework.
Resonance
A word draws a circle around things; the circle is not its whole meaning.
Provenance
Parallel source review reconciled 2026-10-07; human specialist review not claimed.
Cite this entry
Reich, Michael (Hrsg./ed.): „Extension“. Atlas der Sprache, AT-NAV-G02-052. ATLAS 259, data model 1.6.0. https://atlasoflanguage.com/concept/AT-NAV-G02-052The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.