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.

Source: Webster's Revised Unabridged Dictionary (1913)