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plural quindecims
(historical) Synonym of quinzieme, a tax of one fifteenth (0.067%). quotations
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.
2019, Julia Boffey, Henry VII's London in the Great Chronicle, page 71
(chiefly Christianity, archaic) Synonym of quindene, the 14th day after a festival, the fortnight after a festival.