'Coalescence' may refer to:
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Coalescence (genetics), the merging of lineages in backwards time
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Coalescence (linguistics), the merging of two or more words merge into one
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Coalescence (meteorology), the merging of two or more droplets into one
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Coalescence (computer science), the merging of adjacent blocks of memory to fill gaps caused by deallocated memory
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Coalescence (welding), the growing together or growth into one body of the materials being joined
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Coalescence (chemistry), the process by which three separate masses of
miscible substances seem to "pull" each other together should they make the slightest contact.