binary

US /ˈbaɪ.ner.i/
UK /ˈbaɪ.ner.i/
"binary" picture
1.

relating to, composed of, or involving two things

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The system uses a binary classification, either yes or no.
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The choice is binary: you either go or you don't.
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dualdoublepairedtwofold
2.

relating to or expressed in a system of numerical notation that has 2 rather than 10 as its base

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Computers operate using binary code.
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The number 101 is a binary representation of 5.
1.

a system of numerical notation that has 2 rather than 10 as its base

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Computers use binary to process information.
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Learning binary is essential for understanding computer science.