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Origin and history of lustrum

lustrum(n.)

(plural lustra), "ceremonial purification of the Roman people every five years," 1580s, from Latin lustrum "a purificatory sacrifice, ceremony of purification; five-year period," from Proto-Italic *lustro- "expiation," which is of uncertain origin. Perhaps [OED] from root of luere "to wash" (from PIE root *leue- "to wash"). Or [Watkins, Klein], based on a possible earlier meaning "illumination," from PIE *leuk-stro-, from root *leuk- "light, brightness." De Vaan prefers as most likely the explanation "that lustrum was derived from *luH- 'to set free'," with suffix *-stro- also found in monstrum, etc.

Entries linking to lustrum

"pertaining to purification," 1530s, from Latin lustralis "of purification," from lustrum "purification; ritual purification of the Roman people every five years" (see lustrum). Hence, also, "every five years" (1781).

"purify by means of an offering," 1650s, from Latin lustratus, past participle of lustrare "purify ceremonially," from lustrum "purificatory sacrifice" (see lustrum) Related: Lustration (1610s).

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