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Dictionary:

dissociation

  (dĭ-sō'sē-ā'shən, -shē-) pronunciation
n.
  1. The act of dissociating or the condition of having been dissociated.
  2. Chemistry.
    1. The process by which the action of a solvent or a change in physical condition, as in pressure or temperature, causes a molecule to split into simpler groups of atoms, single atoms, or ions.
    2. The separation of an electrolyte into ions of opposite charge.
  3. Psychiatry. A psychological defense mechanism in which specific, anxiety-provoking thoughts, emotions, or physical sensations are separated from the rest of the psyche.

 
 
Antonyms: dissociation

n

Definition: detachment, separation
Antonyms: association, attachment, connection, union

 
Dental Dictionary: dissociation

n

The psychologically induced, distinct partition of separate mental functions (e.g., identity, memory, and awareness) from normal behavior or consciousness.

 
Britannica Concise Encyclopedia: dissociation

Breaking of a chemical compound into simpler constituents as a result of added energy, as in the case of gaseous molecules dissociated by heating; also, the effect of a solvent on a dissolved polar compound (electrolyte), as in the case of an inorganic salt, such as sodium chloride, dissolved in water. All electrolytes dissociate into ions to a greater or lesser extent in polar solvents (in which the molecules are electric dipoles). The degree of dissociation can be used to determine the equilibrium constant. Dissociation is used to explain electrical conductivity and many other properties of electrolytic solutions.

For more information on dissociation, visit Britannica.com.

 
Sports Science and Medicine: dissociation

An attentional style characterized by distraction. Dissociation is exhibited by athletes who are unaware of their surroundings because they are mentally absorbed thinking about other things while participating in their sport. Compare association.

 
Columbia Encyclopedia: dissociation,
in chemistry, separation of a substance into atoms or ions. Thermal dissociation occurs at high temperatures. For example, hydrogen molecules (H2) dissociate into atoms (H) at very high temperatures; at 5,000K about 95% of the molecules in a sample of hydrogen are dissociated into atoms. Electrolytic dissociation occurs when an electrolyte is dissolved in a polar solvent. For example, when hydrogen chloride, HCl, is dissolved in water to form hydrochloric acid, most of its molecules dissociate into hydrogen ions (H+) and chloride ions (Cl−). Some pure substances spontaneously dissociate. For example, in pure water some of the molecules dissociate to form hydrogen ions and hydroxyl ions. Dissociation is generally reversible; when the atoms or ions of the dissociated substance are returned to the original conditions, they recombine in the original form of the substance. The dissociation constant is a measure of the extent of dissociation. It is represented by the symbol K. In the simplest case, if a substance AB dissociates into two parts A and B and the concentrations of AB, A, and B are represented by [AB], [A], and [B], then K=[A]×[B]/[AB]. The dissociation constant is measured at equilibrium, and its value is usually affected by changes in temperature.

 
Veterinary Dictionary: dissociation

The act of separating or the state of being separated.

  • atrial d. — independent beating of the left and right atria, each with normal rhythm or with various combinations of normal rhythm, atrial flutter or atrial fibrillation.
  • atrioventricular d. — independent pacemakers in the atria and ventricles.
  • d. constant — the tendency of a solute to dissociate in solution.
  • hepatocyte d. — hepatocytes becomes detached from their neighboring cells, either generally or locally; a feature of death of the patient.
 
Wikipedia: Dissociation

Dissociation has different meanings in different sciences.



This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

 
 

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Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.  Read more
Answers Corporation Antonyms. © 1999-2008 by Answers Corporation. All rights reserved.  Read more
Dental Dictionary. Mosby's Dental Dictionary. Copyright © 2004 by Elsevier, Inc. All rights reserved.  Read more
Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.  Read more
Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/  Read more
Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.  Read more
Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dissociation".  Read more

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