Un`de*cen"ni*al (?), a. [See
Undecennary, and cf. Decennial.] Occurring or observed
every eleventh year; belonging to, or continuing, a period of eleven years;
undecennary; as, an undecennial festival.
Un`de*cen"ni*al (?), a. [See
Undecennary, and cf. Decennial.] Occurring or observed
every eleventh year; belonging to, or continuing, a period of eleven years;
undecennary; as, an undecennial festival.