Decennovary a. : Pertaining to the number nineteen; of nineteen years.

Example:


Taxonomy
Noah, Webster's Dictionary, Search, the Christian, Christian religion, English, free government, PayPal account, welcome donations, first things, truth, rights and privileges, free people, Preface, celebration, Birthday, Please update your bookmarks, DECEN.

Defination from the web:
... decennovary. DECEN'NOVARY, a. [L. decem, ten, and novem, nine.] Pertaining to the number nineteen; designating a period or circle of nineteen years. ...