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ENGLISH · A WORD WITH POSSIBILITIES

semicentennial.

Of or related to a 50th anniversary, occurring every 50 years.

14 characters5 syllables approx.English language

Meaning & usage

adj/ˌsɛˌmaɪsnˈtɛniəl/General-American/ˌsɛmisnˈtɛniəl/General-American/ˌsɛˌmaɪsənˈtɛniəl/General-American/ˌsɛmisənˈtɛniəl/General-American
  1. Of or related to a 50th anniversary, occurring every 50 years.

    not-comparable
Where this word comes from

From semi- (“half”) + centennial (“100 year, 100th anniversary”), q.v.

noun/ˌsɛˌmaɪsnˈtɛniəl/General-American/ˌsɛmisnˈtɛniəl/General-American/ˌsɛˌmaɪsənˈtɛniəl/General-American/ˌsɛmisənˈtɛniəl/General-American
  1. A 50th anniversary.

    The city celebrated its semicentennial last year.
Where this word comes from

From semi- (“half”) + centennial (“100 year, 100th anniversary”), q.v.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.