# complementarity

> English word · Noun · IPA /ˌkɒmpləmɛnˈtæɹɪti/ · frequency rank #67,322

## Definitions
1. The state or characteristic of being complementary.
2. A semantic relationship between two words wherein negative use of one entails the affirmative of the other with no gradability; the relation of binary antonyms.
3. The idea that physical phenomena may have (mutually contradictory) properties that cannot be observed simultaneously (e.g. wave-particle duality).

## Etymology
From complementary + -ity.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/complementarity