septennate
noun
sep·ten·nate
sepˈteˌnāt,
-nə̇t;
ˈseptəˌnāt
plural -s
: a period of seven years
especially : a seven-year term of office
Word History
Etymology
French septennat, from septennal septennial (from Late Latin septennalis, from Latin septennis of seven years + -alis -al) + -at -ate