Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: Latin
Origin: septuagenarius 'containing seventy', from septuaginta 'seventy'

septuagenarian

 noun
     
sep‧tu‧a‧ge‧nar‧i‧an [countable]
someone who is between 70 and 79 years old
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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