Source : Webster's Revised Unabridged Dictionary (1913)

Quinary \Qui"na*ry\, a. [L. quinarius, from quini five each,
   akin to quinque five: cf. F. quinaire. See {Five}.]
   Consisting of five; arranged by fives. --Boyle.

   {Quinary system} (Zo["o]l.), a fanciful classification based
      on the hypothesis that each group contains five types.