dissociation

Etymology

It is borrowed from Latin dissociātiō (“separation”),^[2][3][4] a noun of action from dissociō (“to separate from companionship, disunite”),^[2][5] from dis- (“apart”) and sociō (“to join”), from socius (“companion, ally”).^[5][2] Etymonline takes it through French dissociation,^[5] which the OED notes from the 16th century, and the Shorter Oxford allows either source.^[2][6] Dictionary.com analyses it as dis- plus a form of association, modelled on the Latin word.^[7] It is the noun of dissociate.^[5][6]

Earliest recorded meaning

Severance or division, the action of dissociating: 1611, in Cotgrave's French–English dictionary.^[2][4] Etymonline dates it to the 1610s.^[5]

Semantic evolution

The word kept its general sense of separation, and in the 19th and 20th centuries acquired technical ones.^[2] In chemistry it meant from 1869 the breaking up of a compound into its elements or simpler compounds, especially by heat;^[2] Merriam-Webster Unabridged notes that the parts can usually recombine under other conditions.^[4] In psychology it was used from 1890, by William James, for the breaking up of associations of ideas,^[2] and later, from 1897, for the disintegration of personality or consciousness.^[2] In 1921 T. S. Eliot used it in his essay on the Metaphysical poets for a separation of thought from feeling that he saw in English poetry from the later 17th century.^[2]

Timeline

• 1611 – severance, division, disunion.^[2][4]
• 1869 – chemistry, the separation of a compound into simpler substances.^[2]
• 1890 – psychology, the breaking up of associations of ideas.^[2]
• 1897 – the disintegration of personality or consciousness.^[2]
• 1921 – T. S. Eliot's term for a separation of thought from feeling in poetry.^[2]

Meanings

Noun

1. The act of dissociating, or the state of being dissociated; separation.^[8][4][2]
2. (chemistry) The usually reversible breaking up of a compound into simpler molecules, atoms, ions or radicals.^[8][4][6]
3. (psychiatry) A sense of disconnection from the outside world or from one's own consciousness or identity, as in some mental disorders.^[8][2]

Word family

• dissociative
• photodissociation

Related words

• dissociate
• association
• social
• society

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o p q Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
4. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
5. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
6. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
7. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
8. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins