keystone Definition

headstone, cornerstone, linchpin, centerpiece, lynchpin, bedrock, pillars, mainstay, pillar, backbone, touchstone, fulcrum, key, foundation, lifeblood, groundwork, milestone, priority, pivot, base, centrepiece, angular, geometry, basis, heart, geometric, vault, clé, basement, capstone, integral, underpinning, component, crown jewel, hallmark, focal point, sine qua non, lodestone, part, plank, boon, holy grail, prerequisite, catalyst, staple, embodiment, element, cements, vanguard, death knell, underpinnings, facet, centrality, bulwark, precursor, leitmotiv, leitmotif, complements, bolsters, changer, jewel, paramount, definer, heralds, consociational, forerunner, crown jewels, anathema, symbol, wellspring, tenet, landmark, vestige, hinges, buzzword, precondition, masterstroke, springboard, framework, revivification, bismarckian, panacea, prime mover, guidepost, bridgehead, fundament, theme, achilles heel, epitome, preeminence, antithesis, watchword, powerhouse, reinvigoration, buttresses, signifier, fertile crescent, primacy, fallback, blueprint,