semicentenarian

/ˌsɛˌmaɪˌsɛnəˈnɛriən/

semicentenarian means synonym of fiftysomething: A person celebrating a semicentenary; a person between 50 and 59 years old.

semicentenarian is pronounced /ˌsɛˌmaɪˌsɛnəˈnɛriən/.

Etymology

From semicentenary (“50 year, 50th anniversary”) + -ian (“person”), equivalent to semi- (“half”) + centenarian (“100-year-old”), q.v.

noun

Synonym of fiftysomething: A person celebrating a semicentenary; a person between 50 and 59 years old.