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Overlap may mean one of:

  • In music theory, overlap is a synonym for reinterpretation of a chord at the boundary of two musical phrases.
  • In railway signalling, an Overlap (railway signalling) is the length of track beyond a stop signal that is proved to be clear of obstructions, such as other trains, in the controls of the previous signal, as a safety margin.
  • Overlap (road), a place where multiple road numbers overlap.
  • Overlap add, an efficient convolution method using FFT.
  • Overlap coefficient, a similarity measure between sets.
  • Orbital overlap, important concept in quantum mechanics describing a type of orbital interaction. Overlap in molecules affects bond strength.