Definitions

from The Century Dictionary.

  • Once in seven years.

from the GNU version of the Collaborative International Dictionary of English.

  • adverb Once in seven years.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adverb Once in every seven years.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

septennial +‎ -ly

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