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cohere â(third-person singular simple present coheres, present participle cohering, simple past and past participle cohered) 1  To stick together physically, by adhesion or figuratively by common purpose. Separate molecules will cohere because of electromagnetic force. 2  To be consistent as part of a group.
Coherent Light. Coherence is a property of light that enables waves to form temporary or stationary interference patterns. Coherence is defined to two waves. If two waves are monochromatic (having the same wavelength) and are of the same phase, these two waves are defined as coherent waves. Sources generating such waves are known as coherent sources.