Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Relating to or proceeding by sixties.
  • adjective Sexagenarian.
  • noun A sexagenarian.

from The Century Dictionary.

  • Pertaining to the number sixty; composed of or proceeding by sixties; specifically, sixty years old; sexagenarian. Also sexagenal.
  • noun A sexagenarian.
  • noun A thing composed of sixty parts or containing sixty.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Something composed of sixty parts or divisions.
  • noun A sexagenarian.
  • adjective Pertaining to, or designating, the number sixty; poceeding by sixties; sixty years old.
  • adjective See under Sexagesimal.
  • adjective (Math.) a scale of numbers in which the modulus is sixty. It is used in treating the divisions of the circle.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective of or pertaining to the number sixty; composed of, or proceeding by sixties
  • adjective sexagenarian
  • noun sexagesimal
  • noun sexagenarian

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin sexāgēnārius, from sexāgēnī, sixty each, from sexāgintā, sixty : sex, six; see sex– + -gintā, ten times; see dekm̥ in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the French sexagenaire, itself from the Latin sexāgēnārius ("of or containing sixty”, “sixty years old”, “a man of sixty").

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