coessentialnessn.
Etymology: < coessential adj. + -ness suffix.Previous versions of the OED give the stress as: coeˈssentialness.
rare. Apparently only attested in dictionaries or glossaries.
1727–31 in N. Bailey II.
1775 in J. Ash
This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2021).