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| sem·i·cen·ten·ni·al [ sèmmee sen ténnee əl, sèmmī sen ténnee əl ] |
adjective |
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marking 50th anniversary: marking the date or year that is 50 years after an event
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noun (plural sem·i·cen·ten·ni·als) |
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50th anniversary of event: the 50th anniversary of an important event
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