Become as one (5)
(Other definitions for unite that I've seen before include "Join together, merge" , "Group of workers" , "old coin" , "Pull together" , "Put together" .)
(Other definitions for merge that I've seen before include "Join into one" , "Combine, blend" , "Combine to form a single entity" , "Combine, coalesce" , "Blend, coalesce" .)