1. Physics. A property of waves characterized by a synchronous run. Waves can show coherence temporally (frequency), spatially (direction of propagation) or in phase. If two waves are completely coherent (that means in all three properties) they superimpose. Partial coherence leads to partial extinction.
2. Optics. Two waves are coherent if they oscillate in the same plane with the same frequency (e.g. laser).
3. Acoustics. Two sound waves emitted by different transmitters are coherent if they have the same amplitude and if the phase shift between them is constant.
4. Communications engineering. Two radar impulses are coherent if they are in phase.
5. Medicine. Synchronization of heart beat, breathing, and blood pressure.
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