Word.ws English Dictionary

septendecennial

/ˌsɛptəndɛˈsɛn.i.əl/

septendecennial adjective: occurring every seventeen years; pertaining to or designating a seventeen-year interval.

Adjective

septendecennial (not comparable)

  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

Synonyms of septendecennial

  • heptadecennial

Origin of septendecennial

From Latin septendec(im) (“seventeen”) + -ennial, after biennial, septennial, etc. By surface analysis, septen- + decennial.

Words formed from septendecennial

  • septendecenniality

Questions about septendecennial

What does septendecennial mean?
Septendecennial means occurring every seventeen years; pertaining to or designating a seventeen-year interval.
What part of speech is septendecennial?
Septendecennial is an adjective.
How do you pronounce septendecennial?
Septendecennial is pronounced /ˌsɛptəndɛˈsɛn.i.əl/.

Words near septendecennial in the dictionary

  1. septenarii
  2. septenarius
  3. septenars
  4. septenary
  5. septenate
  6. septendecennial
  7. septendecillion
  8. septendecillions
  9. septendecimal
  10. septennate
  11. septennates

Source and license

Adapted from Wiktionary: septendecennial (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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