adj · noun · 2 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ˌsɛ.miˌkwɪn.sɛnˈtɛn.i.əl/
Southern-England:Recorded audio is listed in the source snapshot.
General-American:/ˌsɛ.miˌkwɪn.sɛnˈtɛn.i.əl/
General-American:/-maɪ-/
General-American:Recorded audio is listed in the source snapshot.
rhymes with -ɛniəl
1
adj
Meaning 1
Of or relating to a 250th anniversary.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: sestercentenary
Antonyms: none provided
2
noun
Meaning 2
A 250th anniversary.
Definition source: English Wiktionary via Wiktextract
Examples
The year 2026 will mark the semiquincentennial of the founding of the United States.
Meaning relationships
Synonyms: sestercentennial
Antonyms: none provided
Broader terms: anniversary
History
Etymology
Etymology tree Proto-Indo-European *sem- Proto-Indo-European *sēmi Latin sēmi-bor. English semi- Proto-Indo-European *pénkwe Proto-Italic *kwenkwe Latin quīnqueder. English quin- Latin centennis Proto-Indo-European *-(i)yós Proto-Italic *-ijos Proto-Italic *-ios Old Latin -ios Latin -ius Latin -ium Late Latin centennium Proto-Indo-European *h2el-der.? Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English centennial English quincentennial English semiquincentennial From semi- (prefix meaning ‘half’) + quincentennial (“500th anniversary”).
Across languages
Translations
23 source translations are retained for this English entry.
Finnish:
250-vuotinen
— of or relating to a 250th anniversary
French:
semi-quincentenaire
— of or relating to a 250th anniversary
French:
demi-quincentenaire
— of or relating to a 250th anniversary
French:
demi-cincentenaire
— of or relating to a 250th anniversary
French:
semi-cincentenaire
— of or relating to a 250th anniversary
Italian:
semiquincentenario
— of or relating to a 250th anniversary
Italian:
semicinquecentenario
— of or relating to a 250th anniversary
Polish:
związany z dwieście pięćdziesiątą rocznicą
— of or relating to a 250th anniversary
Portuguese:
semiquincentenário
— of or relating to a 250th anniversary
Spanish:
semiquincentenario
— of or relating to a 250th anniversary
