Etymology

septennium

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Today it means: A period of seven years. Full definition →

First used 1660Late Latin septennium
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The story

  1. Late Latin · borrowed fromseptennium
  2. English todayseptennium

From Late Latin septennium, from septennis (“7-year”) + -ium (suffix forming abstract nouns).

First known use, by meaning

  • 1660 A period of seven years.

Etymology from Wiktionary, CC BY-SA 4.0.