Unite is defined as to join or bring together.(verb)
An example of unite would be the countries in the European Union coming together on a common interest.
See unite in Webster's New World College Dictionary
Origin: ME unyten < L unitus, pp. of unire, to unite < unus, one
Origin: < ME, united: with reference to the union of England and Scotland
See unite in American Heritage Dictionary 4
verb u·nit·ed, u·nit·ing, u·nites verb, transitive
Origin: Middle English uniten
Origin: , from Latin ūnīre, ūnīt-
Origin: , from ūnus, one; see oi-no- in Indo-European roots.
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