1. Become one
   "Germany unified officially in 1990";
   - unite, merge
    
2. To bring or combine together or with something else
   "resourcefully he unified music and dance";
   - mix, mingle, commix [archaic], amalgamate
    
3. Act or bring together for a common purpose or belief
   "the Democratic Party platform unified several splinter groups";
   - unite

Derived forms: unifying, unifies, unified

Type of: alter, change, fall in, integrate, join, modify

Antonym: split up

Encyclopedia: Unify