SESQUICENTENNIAL!
1 year anniversary ANNUAL
2 year anniversary BIENNIAL
3 TRIENNIAL
4 QUADRENNIAL
5 QUINQUENNIAL
6 SEXENNIAL
7 SEPTENNIAL
8 OCTENNIAL
9 NOVENNIAL
10 DECENNIAL
11 UNDECENNIAL
12 DUODECENNIAL
13 TREDECENNIAL
14 QUATTUORDECENNIAL
15 QUINDECENNIAL
20 VEGINTENNIAL or VICENNIAL
50 SEMICENTENNIAL or QUINQUAGENARY
75 SEMISESQUICENTENNIAL
100 CENTENNIAL
125 QUASQUICENTENNIAL
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