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coherence

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co⋅her⋅ence

  [koh-heer-uhns, -her-]
Use coherence in a Sentence
–noun
1. the act or state of cohering; cohesion.
2. logical interconnection; overall sense or understandability.
3. congruity; consistency.
4. Physics, Optics. (of waves) the state of being coherent.
5. Linguistics. the property of unity in a written text or a segment of spoken discourse that stems from the links among its underlying ideas and from the logical organization and development of its thematic content. Compare cohesion (def. 4).
Also, co⋅her⋅en⋅cy.

Origin:
1570–80; coher(ent) + -ence

Synonyms:
3. correspondence, harmony, agreement, rationality.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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co·her·ence   (kō-hîr'əns, -hěr'-)   
n.  

  1. The quality or state of cohering, especially a logical, orderly, and aesthetically consistent relationship of parts.

  2. Physics The property of being coherent, as of waves.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

coherence

a fixed relationship between the phase of waves in a beam of radiation of a single frequency. Two beams of light are coherent when the phase difference between their waves is constant; they are noncoherent if there is a random or changing phase relationship. Stable interference patterns are formed only by radiation emitted by coherent sources, ordinarily produced by splitting a single beam into two or more beams. A laser, unlike an incandescent source, produces a beam in which all the components bear a fixed relationship to each other

Learn more about coherence with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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