sesquicentennial (n.)

• anniversary
• bicentenary
• bicentennial
• biennial
• birthday
• cental
• centare
• centenarian
• centenary
• centennial
• centimeter
• centipede
• centurion
• century
• commemoration
• cwt
• gross
• hecatomb
• hundred
• hundredweight
• jubilee
• quincentenary
• quincentennial
• tercentenary
• tercentennial
• triennial