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Webster 1913 Edition

Duodecennial

Duˊo-de-cen′ni-al

,

Adj.

[L.

duodecennis

;

duodecim

twelve +

annus

year.]

Consisting of twelve years.

[R.]

Ash.

Definition 2025

duodecennial

duodecennial

English

Adjective

duodecennial ‎(not comparable)

Consisting of twelve years.