uniter

Noun

 * 1) Agent noun of unite; one who unites.
 * 2) * 1892, Walt Whitman, "Out of the Cradle Endlessly Rocking," Leaves of Grass (abridged reprint of the 1892 edition), New York: The Modern Library, 1921, p. 213,
 * I, chanter of pains and joys, uniter of here and hereafter, / Taking all hints to use them, but swiftly leaping beyond them, / A reminiscence sing.

Synonyms

 * harmonizer, integrator, mediator, reconciler, unifier, consolidator

Adjective

 * 1) unitary