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(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.semicentenary - 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.semicentenary - of or relating to or marking the 50th anniversary
References in periodicals archive ?
However, in tribute to our semicentenary, we would be remiss, as we close the year, if we did not also reflect on this Journal's published achievements over the past five decades.
In tribute to this semicentenary, this journal will reflect on its published achievements over the past five decades.