radiatio

Pronunciation

• IPA (Classical): [ra.diˈaː.ti.oː]^[1]
• IPA (Ecclesiastical): [ra.diˈat.t͡si.o]^[1]

Forms

radiātiō f (genitive radiātiōnis); third declension^[1]

Etymology

It is from radiō “to shine” with the suffix -tiō, from radius “ray”.^[2][1][3]

Earliest recorded meaning

Köbler's first source is Pliny the Elder, whom he dates 23/24–79 AD, and Pliny uses it of the gleam of marble.^[4][5][6]

Semantic evolution

It meant a gleam, dazzle, a shining, as of marble in Pliny the Elder and of stars in Arnobius.^[2][5][6] Lewis & Short note it is post-Augustan.^[5]

British Medieval Latin used it for the emitting of rays of light, and of the aspects of the stars.^[7] It gave English radiation in the mid-15th century, “act of emitting light”.^[3]

Timeline

• 23/24–79 AD – Pliny the Elder uses it.^[4][5]
• mid-15th century – English radiation is recorded.^[3]

Meanings

Noun

1. A gleam, shining, radiation.^[2]

Related words

• radiō
• radius
• English radiation

References

1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
3. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
5. ^ a b c d Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
6. ^ a b Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
7. ^ 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