quinary

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quinary

(ˈkwaɪnərɪ)
adj
1. consisting of fives or by fives
2. fifth in a series
3. (Mathematics) (of a number system) having a base of five
n, pl -ries
a set of five
[C17: from Latin quīnārius containing five, from quīnī five each]

Quinary

 a set of five things.