linchpinnoun · Level 1 SAT1something that holds separate things togetherTrust proved to be the linchpin of every successful negotiation the diplomat had ever conducted.ModuleLevel 1Registeracademic, argument, common, toneCollectionCollection 023SAT Core planAlso in Collection 023permeate, static, invariable, olfactory, ultimate, impecunious, variance, puerile and 1 more