'Diriment impediment' definitions:

Definition of 'diriment impediment'

(from WordNet)
noun
(canon law) an impediment that invalidates a marriage (such as the existence of a prior marriage)

Definition of 'Diriment impediment'

From: GCIDE
  • Diriment \Dir"i*ment\, a. [L. dirimens, p. pr. of dirimere. See Dirempt.] (Law) Absolute. [1913 Webster]
  • Diriment impediment (R. C. Ch.), an impediment that nullifies marriage. [1913 Webster]