An example of unify is when the states in the United States all came back together after the Civil War as one whole country.
intransitive verb-·fied·, -·fy·ing
Origin of unifyMiddle French unifier from Late Latin unificare: see uni- and -fy
tr. & intr.v.u·ni·fied, u·ni·fy·ing, u·ni·fies
Origin of unifyFrench unifier from Old French from Late Latin ūnificāre Latin ūnus one ; see uni- . Latin -ficāre -fy
(third-person singular simple present unifies, present participle unifying, simple past and past participle unified)
From Old French unifier, from Late Latin unificare.