quinquennial
adjective
                                                                                                                            
                                                            quin·quen·ni·al
                    
                                                                                                              
                                                                                                                                  kwin-ˈkwe-nē-əl  
                                                                                                                              
            kwiŋ-
                                                      
                                                          1
                    
                                          
              
          
                                                      : consisting of or lasting for five years                                      
                
                    
2
                    
                                          
              
          
                                                      : occurring or being done every five years                                      
                
                    
                                                      quinquennial
                                      noun
                                                                            
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  Merriam-Webster unabridged




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