1. quinquagenarian - Noun
2. quinquagenarian - Adjective
(obsolete, rare) Synonym of pentecoster: an officer who commands 50 men.
Synonym of fiftysomething: a person between 50 and 59 years old.
(obsolete, rare) Of or related to command over 50 men.
Of or related to fiftysomethings.
Coordinate terms: vicenarian, tricenarian, quadragenarian, hexagenerian, sexagenarian, septuagenarian, octogenarian, nonagenarian, centenarian, supercentenarian