Explanation
Complementary opposition involves two categories that exclude each other and jointly exhaust a specified domain. Under those conditions, a case outside one category belongs to the other. Domain specification is crucial: objects outside the domain or shifts in usage can invalidate a proposed division. Lack of knowledge about which category a case belongs to does not by itself invalidate the division. For linguistic expressions, analysis must therefore test whether their use actually establishes a complementary opposition. The presence of two contrasting words is insufficient. Gradable opposites typically allow intermediate cases and have a different structure.
Movement of thought
1. Delimit the domain. 2. Define the two conditions. 3. Test mutual exclusion. 4. Test joint exhaustiveness. 5. Examine borderline and unknown cases separately.
Scientific use case
Semantic tests can examine whether negating one expression entails the other under specified conditions.
Example
Within the integers, even and odd form a complementary division, whether or not the parity of a particular integer is known.
Counterexample
Hot and cold do not divide temperatures in this way: a temperature may count as neither in a given context.
Distinction
Distinguish complementarity from gradable opposition, incompatibility alone and an arbitrary pair.
Effect on thought and perception
The analysis distinguishes an exhaustive division from a merely salient contrast.
Resonance
Two sides fit without a gap only when their shared frame is fixed.
Provenance
Parallel source review reconciled 2026-10-07; human specialist review not claimed.
Cite this entry
Reich, Michael (Hrsg./ed.): „Complementarity“. Atlas der Sprache, AT-NAV-G03-038. ATLAS 259, data model 1.6.0. https://atlasoflanguage.com/concept/AT-NAV-G03-038The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.