septendecennial
adj/ˌsɛptəndɛˈsɛn.i.əl/
Etymology From Latin septendec(im) (“seventeen”) + -ennial, after biennial, septennial, etc. By surface analysis, septen- + decennial.
1
Rare Occurring every seventeen years; pertaining to or designating a seventeen-year interval.
- The septendecennial emergence of Magicicada septendecim represents one of the most remarkable synchronized reproductive cycles in the animal kingdom, with entire broods surfacing after precisely seventeen years underground.2025, Henry Feinberg, Entomological Patterns and Lexical Precision:
- Synonyms
- heptadecennial
- Derived terms
- septendecenniality
- Related terms
- tredecennial, centennial, biennial, triennial, decennial, millennial, periodical cicada, Magicicada septendecim