Definition of Dissociation

1. Noun. The act of removing from association.

Generic synonyms: Separation
Derivative terms: Dissociate, Dissociate

2. Noun. A state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently.

3. Noun. (chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ions.
Category relationships: Chemical Science, Chemistry
Generic synonyms: Chemical Action, Chemical Change, Chemical Process
Derivative terms: Dissociate

Definition of Dissociation

1. n. The act of dissociating or disuniting; a state of separation; disunion.

Definition of Dissociation

1. Noun. The act of dissociating or disuniting; a state of separation; disunion. ¹

2. Noun. (chemistry) The process by which a compound body breaks up into simpler constituents; said particularly of the action of heat on gaseous or volatile substances. ¹

3. Noun. (psychology) A defence mechanism where certain thoughts or mental processes are compartmentalised in order to avoid emotional stress to the conscious mind. ¹

¹ Source:

Definition of Dissociation

1. [n -S]

Medical Definition of Dissociation

1. 1. The act of separating or state of being separated. 2. The separation of a molecule into two or more fragments (atoms, molecules, ions or free radicals) produced by the absorption of light or thermal energy or by solvation. 3. A defense mechanism in which a group of mental processes are segregated from the rest of a person's mental activity in order to avoid emotional distress, as in the dissociative disorders or in which an idea or object is segregated from its emotional significance, in the first sense it is roughly equivalent to splitting, in the second, to isolation. 4. A defect of mental integration in which one or more groups of mental processes become separated off from normal consciousness and, thus separated, function as a unitary whole. Origin: L. Sociatio = union This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Dissociation

dissociated anaesthesia
dissociated nystagmus
dissociation (current term)
dissociation by interference
dissociation constant
dissociation constant of a base
dissociation constant of an acid
dissociation constant of water
dissociation energy
dissociation reaction
dissociation sensibility
dissociative anaesthesia
dissociative disorder
dissociative disorders
dissociative drug

Literary usage of Dissociation

Below you will find example usage of this term as found in modern and/or classical literature:

1. Elements of the Comparative Anatomy of Vertebrates by Gustav Mann, Walther Löb, Henry William Frederic Lorenz, Robert Wiedersheim, William Newton Parker, Thomas Jeffery Parker, Harry Clary Jones, Sunao Tawara, Leverett White Brownell, Max Julius Louis Le Blanc, Willis Rodney Whitney, John Wesley Brown, Wi (1906)
"CHAPTER II dissociation-Products WITH the view of throwing light on the constitution of albumins, albuminous substances have been dissociated up to a point ..."

2. Psychology, General Introduction by Charles Hubbard Judd (1917)
"Hypnosis a form of dissociation closely allied to sleep. The condition known as hypnosis has long been the source of superstitious wonder, and much has been ..."

3. Proceedings of the Royal Irish Academy by Royal Irish Academy (1874)
"dissociation of compounds in solution, unless accompanied by some ocular demonstration ... Frequently, however, in mixtures a dissociation is accompanied on ..."

4. Science by American Association for the Advancement of Science (1905)
"plant be fed on one food or another,* this dissociation resulting in the ... First: We should conceive of the respiratory dissociation as taking place in ..."

5. Theoretical Chemistry from the Standpoint of Avogadro's Rule & Thermodynamics by Walther Nernst (1904)
"dissociation.—The more or less complete dissociation of a molecule into its components ... The thorough treatment of dissociation phenomena belongs to the ..."

6. The Determination of Hydrogen Ions: An Elementary Treatise on the Hydrogen by William Mansfield Clark (1920)
"KB C. dissociation residue curve of acid, log —=4.8, or dissociation curve of a ... Kb Kw With the introduction of Kw, the dissociation constant of water, ..."

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