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septuagenarian

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

1705–15; < Latin septuāgēnāri(us) (see septuagenary) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for septuagenarian

septuagenarian

noun
  1. a person who is from 70 to 79 years old
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adjective
  1. being between 70 and 79 years old
  2. of or relating to a septuagenarian
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Word Origin

C18: from Latin septuāgēnārius, from septuāgēnī seventy each, from septuāgintā seventy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for septuagenarian

adj.

"of age 70, seventy-year-old," 1793, from Latin septuagenarius "containing seventy," from septuageni "seventy each," related to septuaginta "seventy" (see Septuagint). Noun meaning "a 70-year-old person" first recorded 1805. As an adjective, septuagenary is recorded from c.1600.

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Online Etymology Dictionary, © 2010 Douglas Harper