Also found in: Thesaurus, Wikipedia.


 (sĕm′ē-sĕn-tĕn′ē-əl, sĕm′ī-)
Marking the 50th anniversary of an event.
A 50th anniversary or its celebration.


1. (prenominal) of or relating to the 50th anniversary of some event
2. occurring once every 50 years
a 50th anniversary


(ˌsɛm i sɛnˈtɛn i əl, ˌsɛm aɪ-)

1. of or pertaining to a fiftieth anniversary.
2. a fiftieth anniversary.
3. a celebration of this.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.semicentennial - the 50th anniversary (or the celebration of it)
anniversary, day of remembrance - the date on which an event occurred in some previous year (or the celebration of it)
Adj.1.semicentennial - of or relating to or marking the 50th anniversary
References in periodicals archive ?
Fellows from all around the world from every decade since 1965 represented the Trust at the reception and to mark its semicentennial.
The coin, authorized by Public Law 110-451, commemorates the semicentennial of the enactment of the Civil Rights Act of 1964.
6) These include the uniqueness of Howard as the only institution for blacks with the status of being a university, which conceivably was an empowering experience for its black students; the university's grand plans to commemorate the semicentennial of its founding in 1867; administration and faculty involvement in plans for supporting the nation's participation in World War I (e.
At the semicentennial ceremonies in 1887 it was reported that of the women who served under the ABCFM, 261, more than one fifth, 56 in all, had been educated at Mount Holyoke.
The two-hour get-together features make-your-own masterpieces with materials provided by the association, an exhibit of work selected for the second annual National Juried Art Show and refreshments to celebrate the association's semicentennial.
This semicentennial vintage, just released in January, boasts rich, complex flavors--dark prunes, chocolate, maraschino cherries, cumin, cardamom--and a lingering finish of sherry, oak and a hint of peat smoke.