Something that can be broken into two categories is binary. Binary means something close to dual or double.

You can remember what binary means if you know that bi- means two. Black and white are often set up as a binary, as are light and dark and good and evil. One binary we see all the time is the male and female symbols you see on bathroom doors. In computing, binary is a code of zeros and ones (computer programming) also known as base two. A binary is also a double star — two stars revolving around each other.

Definitions of binary
  1. adjective
    of or pertaining to a number system having 2 as its base
    “a binary digit”
  2. adjective
    consisting of two (units or components or elements or terms)
    “a binary star is a system in which two stars revolve around each other”
    “a binary compound”
    “the binary number system has two as its base”
    having or involving or consisting of more than one part or entity or individual
  3. noun
    a system of two stars that revolve around each other under their mutual gravitation
    synonyms: binary star, double star
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    the brightest star in Taurus
    the second brightest star in Perseus; the first known eclipsing binary
    Alpha Centauri
    brightest star in Centaurus; second nearest star to the sun
    double star 15.7 light years from Earth; the brightest star in the Aquila constellation
    the brightest star in Scorpius
    Epsilon Aurigae
    the largest known star
    the brightest star in Canis Minor
    Beta Orionis
    the brightest star in Orion
    the brightest star in the sky; in Canis Major
    the brightest star in the constellation Lyra
    type of:
    (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
  4. noun
    a pre-compiled, pre-linked program that is ready to run under a given operating system; a binary for one operating system will not run on a different operating system
    “the same source code can be compiled to produce different binaries for different operating systems”
    synonyms: binary program
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    type of:
    computer program, computer programme, program, programme
    (computer science) a sequence of instructions that a computer can interpret and execute
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