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 is the length of track beyond a stop signal that is proved to be clear of vehicles in the controls of the previous signal, as a safety margin. This article deals with the general meaning of the term "synonym" In the analysis of 18th- and 19th-century Western Music, an elision, overlap, or rather reinterpretation ( Umdeutung) is the perception after Railway signalling is a system used to control Railway traffic safely essentially to prevent Trains from colliding.
• Overlap (road), a place where multiple road numbers overlap
• Overlap-add, an efficient convolution method using FFT
• In sailing, overlap happens when two or more boats/yachts are not clear astern and not clear ahead. A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different Highway, Motorway The overlap-add method (OA OLA is an efficient way to evaluate the discrete Convolution between a very long signal x with a Finite impulse response
• In dramatic speech, overlap means to start saying something, then have someone else start saying the same sentence but starting at a different time.

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