ally (v.) Copy link Outline I. To unite closelyII. To form an alliance with • ally (v.): I. To unite closely: sŏcĭo, 1: to a. oneself to another by the marriage bond, se alicui vinclo jugali s., Virg.: the whole human race is a.d together, omne genus humanum inter se sociatum est, Cic.: Liv.: v. connect, unite. II. To form an alliance with: v. alliance.