verb (used with or without object), u·ni·fied, u·ni·fy·ing.
- to make or become a single unit; unite: to unify conflicting theories; to unify a country.
verb -fies, -fying or -fied
- to make or become one; unite
v.c.1500, “to make into one,” from Middle French unifier (14c.), from Late Latin unificare “make one,” from Latin uni- “one” (see uni-) + root of facere “to make” (see factitious). Related: Unified; unifying. Unified (field) theory in physics is recorded from 1935.