DECENNARY De*cen"na*ry, n.; pl. Decennaries. Etym: [L. decennium a period of ten years; decem ten + annus a year.]
1. A period of ten years.
2. (O. Eng. Law)
Defn: A tithing consisting of ten neighboring families. Burrill.
DECENNIAL
De*cen"ni*al, a. Etym: [See Decennary.]
Defn: Consisting of ten years; happening every ten years; as, a decennial period; decennial games. Hallam.
DECENNIAL
De*cen"ni*al, n.
Defn: A tenth year or tenth anniversary.
DECENNIUM
De*cen"ni*um, n.; pl. Decenniums, L. Decennia. Etym: [L.]
Defn: A period of ten years. "The present decennium." Hallam. "The last decennium of Chaucer's life." A. W. Ward.