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dissociation (dĭ-so″se-a´shәn) the act of separating or state of being separated.
the separation of a molecule into fragments produced by the absorption of light or thermal energy or by solvation.
segregation of a group of mental processes from the rest of a person's usually integrated functions of consciousness, memory, perception, and sensory and motor behavior, as in the separation of personality and aspects of memory or subpersonalities in the dissociative disorders or in the segregation of an idea or object from its emotional significance, as is sometimes seen in schizophrenia.

atrial dissociation 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 dissociation a condition in which the atria and the ventricles contract independently of each other, without synchronization of their rhythms.

electromechanical dissociation pulseless electrical activity.

isorhythmic atrioventricular dissociation a cardiac rhythm in which the atria and the ventricles beat independently and at approximately the same rate.

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