semicentennial Definition

centennial, centenary, jubilarian, octocentenary, tricentenary, anniversary, jubilar, bicentennial, commemoration, commemorate, jubilee, celebration, commemorative, sesquicentennial, anniversarily, bimillenary, commemoratory, bimillennium, bicentenary, monumentalize, merrymake, silver jubilee, fiftieth, remembrance day, tercentenary, sesquicentenary, victory day, quasquicentennial, epinicion, legal holiday, encaenia, memorial, landmark, birthday, historic, independence day, festlich, remembrance sunday, tricentennial, tercentennial, juneteenth, fortieth, christian holy day, moniment, birthnight, victoria day, twelfthtide, inauguration, centuriator, inaugural, merestone, unhistoric, monument, quadricentennial, inaugurally, homecoming, annuary, secle, observance, century, marriage ceremony, memorializer, milestone, parade, centuriate, novennial, religious holiday, twentieth, social occasion, momentous, festivity, annual, historicalness, ceremony, quincentennial, quadragenarian, milliary, quarter day, tricennial, religious festival, hoarstone, reinaugurate, annotinous, memorialize, advent sunday, storied, columbus day, remembrance, memorial day, sixtieth, uncentury, millennium, culmination, julian calendar, military ceremony, reunion, triduan, gala, seventieth, yahrzeit,