Danielle in Oklahoma City, Oklahoma, is looking for a word for a year or anniversary that ends in a 5 or a 0. The word lustrum is an old term for a period of five years that derives from an ancient Roman practice. A quindecennial is a 15-year anniversary. This is part of a complete episode.
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The word “quinquennial” comes to my mind here. It doesn’t necessarily mean ending in five or zero, but it does mean “every five years.”
I work as an actuary (though my BA is in linguistics), and “quinquennial” is a word that gets used particularly when talking about grouping policyholders or applicants. Because sometimes you don’t want to put all the septuagenarians together, but you want to make a distinction between the 70-74-year-olds and those who are 75-79.