Binary

Binary-adj
1-consisting of two parts or two separate elements
2-used to describe a number system, or a number belonging to it, that has 2 rather than 10 as its base
3-consisting of two different chemical elements only
4-consisting of or using two harmless components that, when combine, become extremely toxic
5-see duple

n
1-the binary number system
2-a binary number or digit
3-binary star
4-see binary weapon