In agreement or harmony; consistent with something else.
From Latin concordans, present participle of concordare (to agree together), from con- (with) + cord (heart). The meaning has remained stable: 'of one heart or mind.'
In genetics, concordant twins are those who share the same trait (both have red hair, for example), and this usage reveals something beautiful: the word literally means 'sharing one heart' but we use it for matching genes.
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