septennial

adjective

sep·​ten·​ni·​al sep-ˈte-nē-əl 

1

: occurring or being done every seven years

2

: consisting of or lasting for seven years

septennially

sep-ˈte-nē-ə-lē 

adverb

Examples of septennial in a Sentence

Recent Examples on the Web

The former English schoolkids, tracked by this septennial doc since age 7, are now using the medium to promote their interests. —Wired Staff, WIRED, 1 Oct. 2006

Word History

Etymology

Late Latin septennium period of seven years, from Latin septem + -ennium (as in biennium)

First Known Use

1640, in the meaning defined at sense 1