/ ˌkəʊəˈles; NAmE ˌkoʊə-/ verb
[ v ] coalesce (into / with sth) ( formal ) to come together to form one larger group, substance, etc.
SYN amalgamate :
The puddles had coalesced into a small stream.
► co·ales·cence / ˌkəʊəˈlesns; NAmE ˌkoʊə-/ noun [ U ]
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WORD ORIGIN
mid 16th cent.: from Latin coalescere grow together, from co- (from cum with) + alescere grow up (from alere nourish).