consolidate - unite into one; "The companies consolidated"

consubstantiate - become united in substance; "thought and the object consubstantiate"

syncretise, syncretize - unite (beliefs or conflicting principles)

converge - come together so as to form a single product; "Social forces converged to bring the Fascists back to power"

federate, federalise, federalize - enter into a league for a common purpose; "The republics federated to become the Soviet Union"

integrate - become one; become integrated; "The students at this school integrate immediately, despite their different backgrounds"

coalesce - fuse or cause to grow together

alter, change, modify - cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"

aggregate, combine - gather in a mass, sum, or whole

concoct - make a concoction (of) by mixing

combine, compound - combine so as to form a whole; mix; "compound the ingredients"

blend, immingle, intermingle, intermix - combine into one; "blend the nuts and raisins together"; "he blends in with the crowd"; "We don't intermingle much"

league - unite to form a league

federalize, federate, federalise - unite on a federal basis or band together as a league; "The country was federated after the civil war"

confederate - form a confederation with; of nations

ally with - untie formally; of interest groups or countries

join, fall in, get together - become part of; become a member of a group or organization; "He joined the Communist Party as a young man"

consociate, associate - bring or come into association or action; "The churches consociated to fight their dissolution"

band together, confederate - form a group or unite; "The groups banded together"

reunify, reunite - unify again, as of a country; "Will Korea reunify?"

get hitched with, get married, hook up with, marry, wed, conjoin, espouse - take in marriage

pair, pair off, partner off, couple - form a pair or pairs; "The two old friends paired off"

club - unite with a common purpose; "The two men clubbed together"

alter, change, modify - cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"

consolidate - bring together into a single whole or system; "The town and county schools are being consolidated"

weld - unite closely or intimately; "Her gratitude welded her to him"

consubstantiate - unite in one common substance; "Thought is consubstantiated with the object"