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dissociation
dis·so·ci·a·tion D0290000 (dĭ-sō′sē-ā′shən, -shē-)n.1. The act of dissociating or the condition of having been dissociated.2. Chemistry a. 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.b. The separation of an electrolyte into ions of opposite charge.3. Psychiatry A disintegration or fragmentation of the mind in which memories, thoughts, or aspects of the personality become disconnected, as in multiple personality disorder or some kinds of amnesia.
dis·so′ci·a′tive (-ə-tĭv) adj.dissociation (dɪˌsəʊsɪˈeɪʃən; -ʃɪ-) n1. the act of dissociating or the state of being dissociated2. (Chemistry) chem a. a reversible chemical change of the molecules of a single compound into two or more other molecules, atoms, ions, or radicalsb. any decomposition of the molecules of a single compound into two or more other compounds, atoms, ions, or radicals3. (Chemistry) separation of molecules or atoms that occurs when a liquid or solid changes to a gas4. (Psychiatry) 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 personalitydis•so•ci•a•tion (dɪˌsoʊ siˈeɪ ʃən, -ʃiˈeɪ-)
n. 1. an act or instance of dissociating. 2. the state of being dissociated; disjunction; separation. 3. the decomposition of a substance into simpler molecules or atoms with the addition of heat or energy. 4. 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; < Latin dissociātiō] dis·so·ci·a·tion (dĭ-sō′sē-ā′shən) 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.dissociationThe breaking down of a molecule into smaller molecules, atoms or ions.Thesaurus| Noun | 1. | dissociation - the act of removing from associationseparation - the act of dividing or disconnecting | | 2. | dissociation - a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independentlydisassociationmental condition, mental state, psychological condition, psychological state - (psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic; "a manic state"compartmentalisation, compartmentalization - a mild state of dissociationdissociative disorder - dissociation so severe that the usually integrated functions of consciousness and perception of self break down | | 3. | dissociation - (chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ionschemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactionschemical action, chemical change, chemical process - (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved |
dissociationnoun separation, break, division, distancing, divorce, isolation, segregation, detachment, severance, disengagement, disconnection, disunion a complete dissociation from one anotherTranslationsdissociazionescissioneseparazionedissociatiescheidingdissociation
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 5,000°K; about 95% of the molecules in a sample of hydrogen are dissociated into atoms. Electrolytic dissociation occurs when an electrolyteelectrolyte
, electrical conductor in which current is carried by ions rather than by free electrons (as in a metal). Electrolytes include water solutions of acids, bases, or salts; certain pure liquids; and molten salts.
..... Click the link for more information. is dissolved in a polar solventsolvent,
constituent of a solution that acts as a dissolving agent. In solutions of solids or gases in a liquid, the liquid is the solvent. In all other solutions (i.e., liquids in liquids or solids in solids) the constituent that is present in larger quantity is considered the
..... Click the link for more information. . For example, when hydrogen chloride, HCl, is dissolved in water to form hydrochloric acid, most of its molecules dissociate into hydrogen ionsion,
atom or group of atoms having a net electric charge. Positive and Negative Electric Charges
A neutral atom or group of atoms becomes an ion by gaining or losing one or more electrons or protons.
..... Click the link for more information. (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.Dissociation the process by which molecules break up into a number of simpler particles—molecules, radicals, atoms, or ions. Three types of dissociation are generally distinguished: thermal dissociation, which takes place at elevated temperature (for example, N2O4 ⇄ 2NO2); electrolytic dissociation, which occurs when electrolytes are dissolved (the splitting of the molecules of electrolytes into ions, for example, KOH ⇄ K+ + OH-); and photochemical dissociation, which is observed under the action of light (for example, Cl2 + hγ → 2Cl, where hy is a quantum of light). A quantitative characteristic of dissociation is the degree of dissociation, which is the ratio of the number of molecules that have broken up to the total number of molecules. dissociation[də‚sō·sē′ā·shən] (medicine) Independent, uncoordinated functioning of the atria and ventricles. (microbiology) The appearance of a novel colony type on solid media after one or more subcultures of the microorganism in liquid media. (physical chemistry) Separation of a molecule into two or more fragments (atoms, ions, radicals) by collision with a second body or by the absorption of electromagnetic radiation. (psychology) The segregation of ideas from their affects or feelings, resulting in independent functioning of these components of a person's mental processes. dissociation
dissociation [dis-so″she-a´shun] 1. the act of separating or state of being separated.2. the separation of a molecule into fragments produced by the absorption of light or thermal energy or by solvation.3. 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, flutter" >atrial flutter, or fibrillation" >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.dis·so·ci·a·tion (dis-sō'sē-ā'shŭn, -shē-ā'shŭn), 1. Separation, or a dissolution of relations. For the following chemical, biochemical, and psychiatric senses, avoid substituting the misspelling/mispronunciation dissociation.
See also: Time-Line therapy. Synonym(s): disassociation2. The change of a complex chemical compound into simpler ones by any lytic reaction, by ionization, by heterolysis, or by homolysis.
See also: Time-Line therapy. 3. An unconscious separation of a group of mental processes from the rest, resulting in an independent functioning of these processes and a loss of the usual associations, for example, a separation of affect from cognition.
See also: Time-Line therapy. 4. A state used as an essential part of a technique for healing in psychology and psychotherapy, for instance in hypnotherapy or the neurolinguistic programming technique of Time-Line therapy.
See also: Time-Line therapy. 5. The translocation between a large chromosome and a small supernumerary one. 6. Separation of the nuclear components of a heterokaryotic dikaryon. 7. The disassembly of protomers from a larger marcomolecular complex or polymer. [L. dis-socio, pp. -atus, to disjoin, separate, fr. socius, partner, ally] dissociation (dĭ-sō′sē-ā′shən, -shē-)n.1. The act of dissociating or the condition of having been dissociated.2. Chemistry a. 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.b. 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.
dis·so′ci·a′tive (-ə-tĭv) adj.dissociation Cardiology Electromagnetic dissociation, see there. See also Atrioventricular dissociation, Pulse-temperature dissociation Psychiatry A mental response that diverts consciousness from painful or traumatic associations Examples Shock, numbing, paralysis, loss of speech or other sensory perception, or even loss of consciousness. dis·so·ci·a·tion (di-sōsē-āshŭn) 1. Separation, or a dissolution of relations.
Synonym(s): disassociation. 2. The change of a complex chemical compound into a simpler one by any lytic reaction, by ionization, by heterolysis, or by homolysis. 3. An unconscious separation of a group of mental processes from the rest, resulting in an independent functioning of these processes and a loss of the usual associations; for example, a separation of affect from cognition.
See: multiple personality4. A state used as an essential part of a technique for healing in psychology and psychotherapy, for instance in hypnotherapy or the neurolinguistic programming technique of time-line therapy.
See also: Time-Line therapy5. The translocation between a large chromosome and a small supernumerary one. 6. Separation of the nuclear components of a heterokaryotic dikaryon. dissociation a process in which a chemical combination breaks up into component parts, as with haemoglobin and oxygen. See OXYGEN-DISSOCIATION CURVE.DissociationA psychological mechanism in which the mind splits off certain aspects of a traumatic event from conscious awareness. Dissociation can affect the patient's memory, sense of reality, and sense of identity.Mentioned in: Acute Stress Disorder, Dissociative Disorders, Mental Status Examination, Multiple Personality Disorder, Self-Mutilation, Somatoform DisordersdissociationElimination of the stimulus to fusion. It is usually accomplished by occluding one eye, or by inducing gross distortion of the image seen by one eye (e.g. Maddox rod), or by placing a strong prism in front of one eye (e.g. von Graefe's test) with the result that the eyes will move to the passive position (or heterophoria position). See dissociated heterophoria; passive position; diplopia test; dissociating test.dis·so·ci·a·tion , disassociation (di-sōsē-āshŭn, disă-) An unconscious separation of a group of mental processes from the rest, resulting in an independent functioning of these processes and a loss of usual associations. FinancialSeepartnershipdissociation
Synonyms for dissociationnoun separationSynonyms- separation
- break
- division
- distancing
- divorce
- isolation
- segregation
- detachment
- severance
- disengagement
- disconnection
- disunion
Synonyms for dissociationnoun the act of removing from associationRelated Wordsnoun a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independentlySynonymsRelated Words- mental condition
- mental state
- psychological condition
- psychological state
- compartmentalisation
- compartmentalization
- dissociative disorder
noun (chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ionsRelated Words- chemical science
- chemistry
- chemical action
- chemical change
- chemical process
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