mainstaynoun · Level 3 SAT1a central cohesive source of support and stabilityAgriculture remained the mainstay of the regional economy long after urban centers modernized.ModuleLevel 3Registeracademic, argumentCollectionCollection 040SAT Complete planAlso in Collection 040hypothecate, impeach, excogitate, iterate, inattentive, prognosticator, compendious, protract and 1 more