noun Download 🔗Share A ceremonial purification of all the people, performed every five years after the taking of the census; a lustration. Examples : "In ancient Rome, the lustra, a religious purification ritual, occurred every five years after the census to cleanse the population of any impurities. " ritual religion culture history Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share (by extension) A period of five years. Examples : "The school's new library building project is scheduled for completion within the next lustrum. " time number period Chat with AIVocabulary GamePractice Reading