noun, Cryptography.
a cipher that replaces letters of the plain text with another set of letters or symbols.


Read Also:

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    substitution product n. A product obtained by replacing one atom or group in a molecule with another atom or group.

  • Substitution-reaction

    noun, Chemistry. 1. the replacement of an atom or group of atoms in a compound by another atom or group.

  • Substitution therapy

    substitution therapy n. Replacement therapy in which a substitute substance is used.

  • Substitution transfusion

    substitution transfusion n. See exchange transfusion.

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