Plural of congruency: instances of agreement, compatibility, or the quality of being congruent.
From congruent + -ency (variant of -ence meaning 'quality of being'). Both 'congruence' and 'congruency' exist as alternatives, with 'congruence' being more common.
'Congruency' and 'congruence' mean the same thing, but English speakers sometimes choose 'congruency' in psychology and philosophy to describe agreements between beliefs or attitudes.
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