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septennial

[sep-ten-ee-uh l] /sɛpˈtɛn i əl/
adjective
1.
occurring every seven years.
2.
of or for seven years.
noun
3.
something that occurs every seven years.
Origin
1630-1640
1630-40; < Late Latin septenni(s) (Latin septuennis) seven years old (sept(em) seven + -enn-, combining form of annus year + -is adj. suffix) + -al1
Related forms
septennially, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for septennial

septennial

/sɛpˈtɛnɪəl/
adjective
1.
occurring every seven years
2.
relating to or lasting seven years
Derived Forms
septennially, adverb
Word Origin
C17: from Latin septennis, from septem seven + annus a year
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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