Relating to or expressing concord; characterized by agreement or harmony.
From concord (agreement, harmony) + -ial (of or relating to), parallel to words like cordial, derived from the Latin cord (heart).
While extremely rare, concordial preserves the original sense of concord as 'one heart' (from Latin con- + cord), making it subtly different from just saying 'agreeable'—it implies emotional or fundamental harmony.
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