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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] Quinary system (Zool.), a fanciful classification based on the hypothesis that each group contains five types. [1913 Webster]