Word Study
    Undecennary
CIDE DICTIONARY
Undecennary, a. [L. undecim eleven (unus one + decem ten) + -ennary as in decennary.  Cf. Undecennial.]. 
                                            
                                         Occurring once in every period of eleven years; undecennial.                                                                                 [1913 Webster]                                                                                                                                                                            
                                                                                    
                                                    "An undecennary account laid before Parliament."                                                                                            
                                                     [1913 Webster]                                                
                                                                                                                        
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