Binary (adjective)

1. Consisting of two parts or components.
2. Expressed in or using a system of numeration that has 2 as its base.
3. Relating to or involving two things.

Origin:

From late latin binarius, from bini "two at a time", from latin bis "twice".

Examples:

1. Binary code is a system of representing data using only two digits, usually 0 and 1.
2. Binary stars are two stars that orbit around a common center of mass.
3. Binary opposition is a fundamental concept in linguistics and semiotics.
4. A binary system is a system that has two components.
5. Binary is an adjective that refers to something consisting of or involving two parts or components, or expressed in a system of numeration that has 2 as its base.