— octogenarianism , n.
/ok'teuh jeuh nair"ee euhn/ , adj. Also, octogenary /ok toj"euh ner'ee/ .
1. of the age of 80 years.
2. between 80 and 90 years old.
n.
3. a person who is between 80 and 90 years old.
[ 1805-15; octogenari ( us ) comprising eighty, eighty years old (equiv. to octogen ( i ) eighty each + -arius -ARY) + -AN ]