septennial

sep·ten·ni·al

adj \sep-ˈte-nē-əl\

Definition of SEPTENNIAL

1

: occurring or being done every seven years

2

: consisting of or lasting for seven years

— sep·ten·ni·al·ly \-ə-lē\ adverb

Origin of SEPTENNIAL

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

First Known Use: 1640

Rhymes with SEPTENNIAL

biennial, centennial, decennial, millennial, perennial, quadrennial, quinquennial, triennial, vicennial