Explanation
Functional change is a historical process in which an inherited form acquires a new grammatical or discourse function. A formerly aspectual form comes to be used as a discourse marker while its older function survives only in fixed expressions. Do not collapse exaptation, grammaticalisation, semantic change and synchronic polysemy. Two current meanings alone do not demonstrate a historical change of grammatical function.
Movement of thought
1. Identify the earlier function. 2. Date evidence for the new use. 3. Compare surviving older uses. 4. Test functional rather than merely lexical change. 5. Assess exaptation separately from grammaticalisation.
Scientific use case
Historical corpus work dates competing functions and tests whether reanalysis or mere semantic variation is involved.
Example
A formerly aspectual form comes to be used as a discourse marker while its older function survives only in fixed expressions.
Counterexample
Two current meanings alone do not demonstrate a historical change of grammatical function.
Distinction
Do not collapse exaptation, grammaticalisation, semantic change and synchronic polysemy.
Effect on thought and perception
Historical comparison can reveal new functions of a surviving form.
Resonance
A form remains while its task changes.
Provenance
Separate AI English review passed; final author file f69b81c80ae2de2a71d727c8a73448a9de4569250e40024fa9c9b714ccbcfa78
Cite this entry
Reich, Michael (Hrsg./ed.): „Functional change“. Atlas der Sprache, AT-NAV-G03-003. ATLAS 259, data model 1.6.0. https://atlasoflanguage.com/concept/AT-NAV-G03-003The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.