Word Study
    Lustrum
WORDNET DICTIONARY
Noun Lustrum has 2 senses
CIDE DICTIONARY
Lustrum, n. [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.                                                                                 [1913 Webster]                                                                                                                    
                                                                                    OXFORD DICTIONARY
Lustrum, n.  (pl.  lustra or lustrums) a period of five years.
                    Etymology
                        L, an orig. purificatory sacrifice after a quinquennial census
                                    
            For further exploring for "Lustrum" in Webster Dictionary Online
        


    
 (NT only) to listen to the NET Bible