keystoneEnglishOxford American Thesauruskeystone noun 1 a carved head formed the keystone of the door: cornerstone, central stone, quoin. 2 cooperation remains the keystone of the government's security policy: foundation, basis, linchpin, cornerstone, base, principle, guiding principle, core, heart, center, crux, fundament, mainspring, priority.
EnglishOxford American ThesaurusEnglishOxford American Thesaurus
EnglishOxford American Thesaurus