radix

/ˈreɪdɪks/
noun
  1. The base of a system of numbers, such as 10 in the decimal system or 2 in binary.
    • The radix of the decimal system is 10.
    • Changing the radix of a number changes how it is written.
    • In binary, the radix is 2, so only digits 0 and 1 are used.
  2. A root or source from which something develops.
    • Ancient languages often form the radix of modern vocabulary.
    • The radix of the problem lies in poor communication.
    • The radix of the tree's growth was its deep root system.
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