septennial


sep·ten·ni·al

adjective \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

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