Definition of "octogenarian" in English

noun

1. Synonym of eightysomething: a person between 80 and 89 years old.

   • Mama was by no means the only grandma present, for the octogenarians had turned out en masse from their huts and lean-tos and were paddling about, diving and splashing as unconcernedly as though they really belonged in the sea rather than on land.

adjective

1. Of or related to eightysomethings.