Etymology and origin of the Latin word illusorius
- Confidence
- Established
- Formation
- Derivation
- First attested
- c. 340–397 Ambrose More words from the 4th century
- Ultimate origin
- Latin illūdō
From the same root
Forms
illūsōrius (feminine illūsōria, neuter illūsōrium); first/second-declension adjective[1] It is also spelled inlusorius.[2][3]
Etymology
It is from Latin illūdō (“to mock, make sport of”),[2][4] formed on the stem of its past participle with the suffix -ōrius.[4] The TLL allows a derivation from the agent noun illūsor (“mocker”) as well as from the verb, comparing dēceptōrius.[5]
Earliest recorded meaning
Lewis and Short call it Late Latin and give Ambrose (c. 340–397 AD) and Augustine (354–430 AD) for the sense “mocking”:[6][2] Ambrose writes of an illusoria adoratio, worship offered in mockery,[6][7] and Augustine of the robe put on Christ in derision.[5][8]
Semantic evolution
Julian of Eclanum used it for deceptive,[5][8] and a glossary has the neuter as a noun for mockery.[5][7] Bede calls a vision possibly inlusoria, a delusion,[3] and medieval writers used it for deceitful, illusory, imaginary, feigned and futile.[9][10][3]
English took it over as illusory in the 16th century, through French.[4]
Timeline
- c. 340–397 AD – Ambrose uses it of mocking worship.[6][7][2]
- 354–430 AD – Augustine uses it of the robe of derision.[5][6][2]
- 1st third of the 8th century AD – Bede uses it of a deceptive vision.[3][2]
- 2nd half of the 12th century – Hildegard of Bingen warns against illusoria and fantastic deeds.[10][2]
- 1590s – English borrows it, through French, as illusory.[4]
Meanings
Adjective
- Mocking, given in derision, ironical.[6][5][11]
- (Late Latin) Deceptive, illusory.[5][9][3]
- (Medieval Latin) Imaginary, feigned; futile.[10][3]
- (as a neuter noun) Mockery.[5][7]
Related words
- English illusory
References
- ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ a b c d e f g Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
- ^ a b c d e f Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
- ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
- ^ a b c d e f g h Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
- ^ a b c d e Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
- ^ a b c d Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
- ^ a b Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
- ^ a b Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill
- ^ a b c Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
- ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
Borrowed into
- English illusory
Cite this entry
“Illusorius.” Etymologically, 7 Nov. 2026, etymologically.com/la/illusorius. Accessed 8 Nov. 2026.
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