'Lustra' definitions:

Definition of 'Lustra'

From: GCIDE
  • Lustrum \Lus"trum\, n.; pl. E. Lustrums, L. Lustra. [L. Cf.
  • 2d & 3d Luster.] 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. [1913 Webster]