I. ˈkwīnərē, -win- adjective
Etymology: Latin quinarius, from quini five apiece + -arius -ary; akin to quinque five — more at five
1. : consisting of five : arranged by fives : quintuple
the quinary system is based on counting the fingers of one hand — H.J.Spinden
2. : of the fifth order or rank
II. noun
( -es )
: a quinary group or system