'Synastry' definitions:

Definition of 'Synastry'

From: GCIDE

Synastry \Syn"as*try\, n. [Pref. syn- + Gr. ? a star.] Concurrence of starry position or influence; hence, similarity of condition, fortune, etc., as prefigured by astrological calculation. [R.] --Motley. [1913 Webster]