Agreement or harmony between things; the quality of being suitable, fitting, or in accord with something else.
From Middle English congruite, from Old French congruité, from Latin congruitas, derived from congruus meaning 'coming together' or 'agreeing,' ultimately from congruere meaning 'to coincide' or 'to agree'.
This ancient concept underlies everything from architecture (where proportions must have congruity) to personality psychology (where self-image and reality should have congruity), showing how fitting together properly makes things work.
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