septennially

sep·ten·ni·al

 (sĕp-tĕn′ē-əl)

adj.

1. Occurring every seven years.

2. Consisting of or continuing for seven years.

n.

An event that occurs every seven years.

---

[From Late Latin septennium, period of seven years, from Latin septennis, of seven years : septem, seven; see septm̥ in Indo-European roots + annus, year; see at- in Indo-European roots.]

---

sep·ten′ni·al·ly adv.