relating to or denoting a system of numbers that has two as its base and uses only the digits 0 and 1
binary code
a binary number
involving a choice or condition of two alternatives (e.g. on or off, yes or no)
binary logic
consisting of or marked by two things or parts
relating or combining two mathematical elements
a binary operation
having two musical subjects or two complementary sections
binary form
[late Latin binarius, from Latin bini two by two]