[dih-soh-see-ey-shuhn, -shee-ey-]
an act or instance of dissociating.
the state of being dissociated; disjunction; separation: the dissociation of church and state.
Physical Chemistry.
the reversible resolution or decomposition of a complex substance into simpler constituents caused by variation in physical conditions, as when water gradually decomposes into hydrogen and oxygen under great heat in such a way that when the temperature is lowered the liberated elements recombine.
Psychiatry. the splitting off of a group of mental processes from the main body of consciousness, as in amnesia or certain forms of hysteria.

1605–15; dis-1 + (as)sociation, modeled on Latin dissociātiō separation

self-dissociation, noun
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World English Dictionary
dissociation (dɪˌsəʊsɪˈeɪʃən, -ʃɪ-)
1.  the act of dissociating or the state of being dissociated
2.  chem
 a.  a reversible chemical change of the molecules of a single compound into two or more other molecules, atoms, ions, or radicals
 b.  any decomposition of the molecules of a single compound into two or more other compounds, atoms, ions, or radicals
3.  separation of molecules or atoms that occurs when a liquid or solid changes to a gas
4.  psychiatry the separation of a group of mental processes or ideas from the rest of the personality, so that they lead an independent existence, as in cases of multiple personality

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American Heritage
Medical Dictionary

dissociation dis·so·ci·a·tion (dĭ-sō'sē-ā'shən, -shē-)

  1. The chemical 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. Separation of a group of related psychological activities into autonomously functioning units, as in the generation of multiple personalities.

dis·so'ci·ate' v.
dis·so'ci·a'tive adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dissociation   (dĭ-sō'sē-ā'shən)  Pronunciation Key 
The separation of a substance into two or more simpler substances, or of a molecule into atoms or ions, by the action of heat or a chemical process. Dissociation is usually reversible.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The electricity from the cell powers the dissociation and the heat makes the process more efficient.
Looked at from a longer distance, the statement suggested a degree of mental dissociation.
The result was a dissociation between the experience and the commentary.
Dissociation refers to the breaking of a chemical bond without reference to whether the products are ions or neutral fragments.
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