the GNU version of the Collaborative International Dictionary of English
adj. Of the same kind or nature; having the same substance or essence; coessential.
The Century Dictionary and Cyclopedia
Having the same substance or essence; coessential.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. regarded as the same in substance or essence (as of the three persons of the Trinity)
Word Usage
"Athanasians and the Eusebians; but Theodoric could not regard him as a man unfaithful to God, because he had rejected the term consubstantial, after admitting it at first."