coalesce /ˌkəʊəˈlɛs/ (v)

If two or more things coalesce, they come and grow together to form one thing or system; merging of two segments into one.

to combine into a single group or thing.

The theory is that galaxies coalesced from smaller groups of stars.

The puddles had coalesced into shallow streams.

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coalescence (n) coalescing

Sym: unite, merge, meld, blend, conjoin, come together, cleave