septennial

septennial

[sep-ten-ee-uhl]
adjective
1.
occurring every seven years.
2.
of or for seven years.
noun
3.
something that occurs every seven years.

Origin:
1630–40; < Late Latin septenni(s) (Latin septuennis) seven years old (sept(em) seven + -enn-, combining form of annus year + -is adj. suffix) + -al1

septennially, adverb
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World English Dictionary
septennial (sɛpˈtɛnɪəl)
 
adj
1.  occurring every seven years
2.  relating to or lasting seven years
 
[C17: from Latin septennis, from septem seven + annus a year]
 
sep'tennially
 
adv

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