Main Entry: sep·ten·ni·al

Pronunciation: \sep-ˈte-nē-əl\

Function: adjective

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

Date: 1640

1 : occurring or being done every seven years
2 : consisting of or lasting for seven years

— sep·ten·ni·al·ly \-ə-lē\ adverb