decennalian
adjEtymology From Latin decennalis (“decennial”) + -ian, from decennium (“10-year period”) + -alis (“-al: forming adjectives”), from decem (“ten”) + annus (“year”).
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Obsolete Synonym of decennial, of or related to a ten-year period.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.