Lus·trum n.; pl. E. Lustrums L. Lustra   A lustration or purification, especially the purification of the whole Roman people, which was made by the censors once in five years. Hence: A period of five years.
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  lustre
       n 1: a surface coating for ceramics or porcelain [syn: luster]
       2: a quality that outshines the usual [syn: luster, brilliancy,
           splendor, splendour]
       3: the visual property of something that shines with reflected
          light [syn: shininess, sheen, luster]
       [also: lustra (pl)]