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Lustrum
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<p>A lūstrum (IPA: [ˈluːs̠t̪rʊ̃ˑ], plural lūstra) was a term for a five-year period in <a href="/facts/Ancient_Rome/cGqIuxPd">Ancient Rome</a>. </p><p>It is distinct from the <a href="/facts/Homograph/fsFGgM4j">homograph</a> <i>lustrum</i> (/ˈlʊstrəm/ LUSS-trəm): a haunt of wild beasts (and figuratively, a den of vice), plural <i>lustra</i> (/ˈlʊstrɑː/ LUUS-trah). </p>