GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Coherent (?), a. [L. cohaerens, p. pr. See Cohere.]
   1. Sticking together; cleaving; as the parts of bodies; solid or fluid.  Arbuthnot.
   
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   2. Composed of mutually dependent parts; making a logical whole; consistent; as, “a coherent plan, argument, or discourse”.
   
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   3. Logically consistent; -- applied to persons; as, “a coherent thinker”.  Watts.
   
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   4. Suitable or suited; adapted; accordant. [Obs.]
   
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   Instruct my daughter how she shall persever,
   
   That time and place, with this deceit so lawful,
   
   May prove coherent. Shak.
   
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   5. (Physics, Optics) Of or pertaining to electromagnetic waves that have a constant phase relationship with each other; having identical phase at all points; as, “the coherent light produced by a laser”.
   
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