/ · 1894 Brewer’s · L · Lustrum
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A space of five years. The word means a purification. These public expiations were made at Rome by one of the censors every fifth year, at the conclusion of the census. (Latin, luʹere, to purify.)
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.