Source : Webster's Revised Unabridged Dictionary (1913)

Congruity \Con*gru"i*ty\ (? or ?), n.; pl. {Congruities}. [Cf.
   F. congruit?.]
   1. The state or quality of being congruous; the relation or
      agreement between things; fitness; harmony;
      correspondence; consistency.

            With what congruity doth the church of Rome deny
            that her enemies do at all appertain to the church
            of Christ?                            --Hooker.

            A whole sentence may fail of its congruity by
            wanting one particle.                 --Sir P.
                                                  Sidney.

   2. (Geom.) Coincidence, as that of lines or figures laid over
      one another.

   3. (Scholastic Theol.) That, in an imperfectly good persons,
      which renders it suitable for God to bestow on him gifts
      of grace.