disillusionment

Etymology

It is formed from English disillusion + -ment.^[2][3][4] The OED compares French désillusionnement.^[2] The base is formed from dis- and illusion,^[2][3] which goes back through Old French illusion (“a mocking, deceit”) to Latin illūsiō (“a mocking, jesting”), from illūdō (“to mock at, play with”).^[3] As a noun the base it is recorded from 1598 in the obsolete sense “illusion”, and since 1851 (1814 in Etymonline) as “freeing from illusion”,^[2][3] while the OED dates the verb only from 1864, after this noun, and Etymonline and Merriam-Webster Unabridged from 1855.^[2][3][5]

Earliest recorded meaning

The process of disillusioning, or the state of being free from illusion: 1855 in Etymonline.^[3] The OED's first record is from 1856, in the Leisure Hour.^[2]

Semantic evolution

The word arose in the mid-19th century, when the noun disillusion was also being used for the same idea.^[2][4] It covers both the action of freeing someone from an illusion and the resulting state;^[2][5] the Historical Thesaurus places it among the words for disappointment.^[6] By the mid-19th century it could also be counted, as a single instance of disenchantment.^[4][5]

Timeline

• 1855 – the process of disillusioning; the state of being free from illusion.^[3] The OED's first record is from 1856.^[2][6]

Meanings

Noun

1. The feeling of disappointment that comes from finding that something is not as good as one believed: His disillusionment with the party grew after the election.^[5][4][2]
2. The act or process of disillusioning someone.^[2][5][3]
3. An instance of being disillusioned; a disenchantment.^[5][4]

Related words

• disillusion
• illusion
• ludicrous

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g h Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c d e Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ a b Kay, Christian; Roberts, Jane; Samuels, Michael; Wotherspoon, Irené, eds. (2009), Historical Thesaurus of the Oxford English Dictionary, Oxford: Oxford University Press; online edition (2024)