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join [joined, joining, joins]▼(to come together; to meet)
verb
[UK: dʒɔɪn] [US: ˌdʒɔɪn]

unify [unified, unifying, unifies]▼(become one)
verb
[UK: ˈjuː.nɪ.faɪ] [US: ˈjuː.nə.ˌfaɪ]

unite [united, uniting, unites]▼((reciprocal) to come together as one)
verb
[UK: ju.ˈnaɪt] [US: ju.ˈnaɪt]