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Definition of Sesquicentennial
1. Noun. The 150th anniversary (or the celebration of it).
Definition of Sesquicentennial
1. Adjective. Occurring every 150 years ¹
2. Adjective. Of, or relating to a sesquicentenary ¹
3. Noun. A 150th anniversary. ¹
¹ Source: wiktionary.com