WordReference Random House Unabridged Dictionary of American English © 2026
con•sub•stan•tial
(kon′səb stan′shəl),USA pronunciation adj.
con′sub•stan′tial•ism, n.
con′sub•stan′tial•ist, n.
con′sub•stan′ti•al′i•ty, n.
con′sub•stan′tial•ly, adv.
- of one and the same substance, essence, or nature.
- Late Latin consubstantiālis, equivalent. to con- con- + substanti(a) substance + -ālis -al1
- Middle English 1350–1400
con′sub•stan′tial•ist, n.
con′sub•stan′ti•al′i•ty, n.
con′sub•stan′tial•ly, adv.