octennial

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɒkˈtɛnɪəl/US:USA pronunciation: respellingUSA pronunciation: respelling(ok ten′ē əl)


WordReference Random House Unabridged Dictionary of American English © 2025
oc•ten•ni•al  (ok ten′ē əl),USA pronunciation adj. 
  1. occurring every eight years.
  2. of or for eight years.
  • Late Latin octenni(um) eight-year period (oct- oct- + -enn-, combining form of annus year + -ium -ium) + -al1
  • 1650–60
oc•ten′ni•al•ly, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
octennial / ɒkˈtɛnɪəl/
  1. occurring every eight years
  2. lasting for eight years
Etymology: 17th Century: from Latin octennium eight years, from octo eight + annus yearocˈtennially

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