consubstantial (adj.)

"having the same substance or essence," late 14c., a term in the theology of the Trinity, from Church Latin consubstantialis "of like essence, nature, or substance," from assimilated form of com "with, together" (see con-) + substantia "being, essence, material" (see substance). In general use from 1570s. Related: Consubstantially; consubstantiality; consubstantialism.