mix, incorporate, desegregate, redintegrate, complete, reintegrate, make whole, unify, perintegrate, make up, more...

segregate, divide, separate, disassemble, disconnect

definite integral, indefinite integral, line integral, surface integral, volume integral, path integral, double integral, triple integral, more...

to become a part of,   make cohesive,   become whole,   cohere or unify,   to make cohesive,   assimilate into,   to become whole,   become a part,   merge seamlessly,   fit seamlessly