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undecennary (uhn-di-SEHN-uh-ree)
noun
1. A period of eleven years.
2. An eleventh anniversary.
adjective
1. Of or pertaining to a period of eleven years.
2. Occurring every eleven years.
noun
1. A period of eleven years.
2. An eleventh anniversary.
adjective
1. Of or pertaining to a period of eleven years.
2. Occurring every eleven years.