Definitions

1. noun

A period of seven years, especially in the context of a papal reign or a period of a comet’s orbital cycle.

“The astronomer studied the comet’s septennium to predict its next appearance in the skies.”

2. noun

A period of seven years, especially in the context of a biblical or poetic cycle.

“The prophet’s words foretold a septennium of famine and hardship before the land would be reborn.”