COMPLEMENTARITY /ˌkɒmpləmɛnˈtæɹɪti/ Scrabble 26 Words With Friends 31 Definition noun a relation between two opposite states or principles that together exhaust the possibilities. noun the interrelation of reciprocity whereby one thing supplements or depends on the other. See all 2753 words you can make from COMPLEMENTARITY → 15-letter words Words starting with C Words ending with Y ← Unscramble different letters