BINARY: 1: consisting of two things or parts 2: involving two alternatives only (as on-off, yes-no)
"The animals went in two by two, the elephants and the kangaroo..." If you recall how the beasts went into Noah's ark, you'll remember the etymology of "binary," because it traces to the Latin bini, which translates as "two by two." Although "binary" can be used for anything with two parts, it is now used especially in relation to computers and information processing. Digital computers use the binary number system, based on the digits 0 and 1, to process even complex data. In binary form, for instance, the word "HELLO" looks like this: 1001000 1000101 1001100 1001100 1001111.
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