SEPTENNIAL

septennial. Septennial, a. lasting or happening in seven years

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Sep‐ten″ni‐al (?), a. [[L. septennium a period of seven years; septem seven + annus year. See Seven, and Annual.]] 1. 1. Lasting or continuing seven years; as, septennial parliaments.
2. 2. Happening or returning once in every seven years; as, septennial elections in England.