– from Old French concordieux, -euse,
from medieval Latin concordiōsus ,
from concors, concord (of one mind) + -ous
“…the King found himself at more Leisure and Freedom, in the Absence of the Lord Marquess, to study the calling of a Comfortable and Concordious Parliament, wherein the Subject might reap Justice, and the Crown Honour…”
From: Scrinia Reserata:
A Memorial Offer’d to the Great Deservings of John Williams.
By John Hacket, a1670
The Life of Arch-Bishop Williams