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septuagenarian

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sep⋅tu⋅a⋅ge⋅nar⋅i⋅an

[sep-choo-uh-juh-nair-ee-uhn, -too-, -tyoo-]
–adjective
1. of the age of 70 years or between 70 and 80 years old.
–noun
2. a septuagenarian person.

Origin:
1705–15; < L septuāgēnāri(us) (see septuagenary ) + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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sep·tu·a·ge·nar·i·an   (sěp'tōō-ə-jə-nâr'ē-ən, -tyōō-, -chōō-)   
n.  A person who is 70 years old or between the ages of 70 and 80.
adj.  
  1. Being 70 years old or between the ages of 70 and 80.

  2. Of or relating to a septuagenarian.


[From Latin septuāgēnārius, of the number seventy, from septuāgēnī, seventy each, from septuāgintā, seventy; see Septuagint.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

septuagenarian  (adj.)
"seventy-year-old," 1793, from L. septuagenarius "containing seventy," from septuageni "seventy each," related to septuaginta "seventy" (see Septuagint). Noun meaning "a 70-year-old person" first recorded 1805.
Online Etymology Dictionary, © 2001 Douglas Harper
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