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Definition of polyalphabetic in English:

polyalphabetic

Pronunciation /ˌpɒlɪalfəˈbɛtɪk/

adjective

Computing

  • (Of a code or cipher) employing more than one alphabet or set of symbols, so that each letter of the alphabet may be represented by any of two or more letters or other characters.

Origin

1920s; earliest use found in The Daily Express. Compare monoalphabetic.