quindecim

From Medieval Latin quindecima (“15th”), from quindecim (“15”). In reference to 2-week periods, based upon the Roman and medieval practice of counting inclusively.

quindecim (plural quindecims)

1. (historical) Synonym of quinzieme, a tax of one fifteenth (0.067%).
   • 2019, Julia Boffey, Henry VII's London in the Great Chronicle, page 71:

     In this parliament was granted to the king for defence against the Scots two aids and two quindecims, the which two aids did not extend over two quindecims.

2. (chiefly Christianity, archaic) Synonym of quindene, the 14th day after a festival, the fortnight after a festival.

• “quindecim, n.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.

Latin Wikipedia has an article on:

quīndecim

Wikipedia ^la

• Symbol: XV

From quīnque (“five”) + decem (“ten”).

• (Classical Latin) IPA^(key): /ˈkʷiːn.de.kim/, [ˈkʷiːn̪d̪ɛkɪ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈkwin.de.t͡ʃim/, [ˈkwin̪d̪et͡ʃim]

quīndecim (indeclinable)

1. fifteen; 15
   • 77-79 AD, Gaius Plinius Secundus, Naturalis Historia, liber XIV, vii

     quindecim omnino generibus uvarum nominatis, tribus oleae, totidem pirorum, malo vero tantum Assyrio, ceteris omnibus neglectis

     "in all, fifteen varieties of the grape has he named, three of the olive, the same number of the pear, and the citron of Assyria, and has neglected the rest"

   • Late 4th century, Jerome [et al.], transl., edited by Roger Gryson, Biblia Sacra: Iuxta Vulgatam Versionem (Vulgate), 5th edition, Stuttgart: Deutsche Bibelgesellschaft, published 2007, →ISBN, 9:10:
     (Regnum II)

     erant autem Sibae quindecim filii et viginti servi

     "Now Ziba had fifteen sons and twenty servants."

• Appendix:Latin cardinal numerals

• “quindecim”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “quindecim”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• quindecim in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • to decree a public thanksgiving for fifteen days: supplicationem quindecim dierum decernere (Phil. 14. 14. 37)