— septennially , adv.
/sep ten"ee euhl/ , adj.
1. occurring every seven years.
2. of or for seven years.
n.
3. something that occurs every seven years.
[ 1630-40; septenni ( s ) (L septuennis ) seven years old ( sept ( em ) SEVEN + -enn-, comb. form of annus year + -is adj. suffix) + -AL 1 ]