ETYMOLOGY
from Latin plenitudinarius (full, complete, plenary),
from Latin plenitudin-, plenitudo (abundance, fullness, fullness of shape, thickness, full amount, the whole) + -arius (-ary)
EXAMPLE
“…and a strange kind of Government must that needs be, wherein the Servants Throne is above his Masters, and a Subject shall have a plenitudinary power beyond that which his Lord and King had, or, as the times then were, was capable of …”
From: An Historical and Political Discourse of the Laws & Government of England from the First times to the End of the Reign of Queen Elizabeth
By Nathaniel Bacon, 1647
Lexicophilia 