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coalesce [coalesced, coalescing, coalesces]▼(to join into a single mass)
verb
[UK: ˌkəʊə.ˈles] [US: ˌkoʊə.ˈles]

merge [merged, merging, merges]▼((intransitive) to combine into a whole)
verb
[UK: mɜːdʒ] [US: ˈmɝːdʒ]