Semicentenarian
//ˌsɛˌmaɪˌsɛnəˈnɛriən// noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 Synonym of fiftysomething: A person celebrating a semicentenary; a person between 50 and 59 years old.
Etymology
From semicentenary (“50 year, 50th anniversary”) + -ian (“person”), equivalent to semi- (“half”) + centenarian (“100-year-old”), q.v.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.