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Coalescence may refer to:

  • Coalescence (chemistry), the process by which two or more separate masses of miscible substances seem to "pull" each other together should they make the slightest contact
  • Coalescence (computer science), the merging of adjacent blocks of memory to fill gaps caused by deallocated memory
  • Coalescence (genetics), the merging of genetic lineages backwards to a most recent common ancestor
  • Coalescence (linguistics), the merging of two or more phonological segments into one
  • Coalescence (physics), the merging of two or more droplets, bubbles or particles into one
  • COALESCE, an SQL command that selects the first non-null from a range of values
  • In geography, the process by which urban sprawl produces a linear conurbation