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octennial
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octogenarian

oc·to·ge·nar·i·an [ òktə jə nérree ən ] (plural oc·to·ge·nar·i·ans)


noun 
Definition:
 
somebody in his or her eighties: somebody between 80 and 89 years of age

[Early 19th century. < Latin octogenarius< octoginta "eighty," literally "eight times ten"]
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