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lustral

[luhs-truh l] /ˈlʌs trəl/
adjective
1.
of, relating to, or employed in the lustrum, or rite of purification.
2.
occurring every five years; quinquennial.
Origin
1525-1535
1525-35; < Latin lūstrālis. See lustrum, -al1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lustral

lustral

/ˈlʌstrəl/
adjective
1.
of or relating to a ceremony of purification
2.
taking place at intervals of five years; quinquennial
Word Origin
C16: from Latin lūstrālis adj from lustrum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for lustral
adj.

"pertaining to purification," 1530s, from Latin lustralis, from lustrum (see lustrum). Hence, also, "every five years" (1781).

Online Etymology Dictionary, © 2010 Douglas Harper
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