GNU Collaborative International Dictionary of English

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1.       
   Quinary , a. [L. quinarius, from quini five each, akin to quinque five: cf. F. quinaire. See Five.] Consisting of five; arranged by fives.
   Boyle.
   
   1913 Webster
   Quinary system (Zool.), a fanciful classification based on the hypothesis that each group contains five types.
   1913 Webster