binary system

noun
1.
a system involving only two elements, as 0 and 1 or yes and no.
2.
Mathematics. a system of counting or measurement whose units are powers of two. Compare binary ( def 2a ).
3.
Astronomy, binary star.
Also called dyadic system (for defs 1, 2).


Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
binary notation or binary system
 
n
a number system having a base of two, numbers being expressed by sequences of the digits 0 and 1: used in computing, as 0 and 1 can be represented electrically as off and on
 
binary system or binary system
 
n

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Example sentences
They think it was part of a two-star or binary system.
If it actually is in the nebula, perhaps its one member of a former binary
  system, the other star being the one that exploded.
Both pulsars and bursters, astrophysicists have long thought, involve a binary
  system: two stars orbiting each other.
For one thing, the stars may have started life in a binary system, in a tight
  orbit around another star.
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