Coherence is from Latincohaerere = stick together, to be connected with). See:
Coherence (physics). Coherence is an attribute of physical quantities that can be described in terms of waves when a well_defined wavefront can be defined, as in classical optics.
Coherence (linguistics). In linguistics, coherence is what makes a text semantically meaningful.
Coherence (Bayesian statistics). In Bayesian decision theory, an inference system of probabilities and utilities is coherent if it is immune to the possibility of a "Dutch book paradox"; see coherence (philosophical gambling strategy).
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Coherent was capable of running on most Intel-based PCs with Intel 8088, 286, 386, and 486 processors and, like a true Unix, was capable of multitasking and of having multiple users.
Coherent was based on the specifications of Unix Version 7, without reference to any of the Unix source code, either from Bell Labs or BSD.
Coherent was unable to compete with the burgeoning GNU/Linux movement, which, owing to its vast body of contributors, quickly exceeded Coherent in feature set and quality.
The property of coherence is the basis for commercial applications such as holography, the Sagnac gyroscope, radio antenna arrays, optical coherence tomography and telescope interferometers (astronomical optical interferometers and radio telescopes).
In optics, temporal coherence is measured in an interferometer such as the Michelson interferometer or Mach-Zehnder interferometer.
The quantum description of perfectly coherent paths is called a pure state, in which the two paths are combined in a superposition.