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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.
Consider a wave propagating through space. Coherence is a measure of the correlation that exists between the phases of the wave measured at different points. The coherence of a wave depends on the characteristics of its source. Let us look at a simple example.