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DECENNARY, Eng. law. A town or tithing, consisting originally of ten families of freeholders. Ten tithings composed a hundred. 1 Bl. Com. 114.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
But, 1992 is also the year of Commemoration of the World History Association (WHA) decennary. The planning meetings at "Wingspread" (Racine, Wisconsin), where those in attendance were so regally hosted by the Johnson Foundation under the direction of Henry Halstead, seem to be eons, not a decade in the past.