We found one dictionary that defines the word progressive-alphabet ciphers:

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1. progressive-alphabet ciphers: Merriam-Webster

▸ Words similar to progressive-alphabet ciphers ▸ Usage examples for progressive-alphabet ciphers ▸ Idioms related to progressive-alphabet ciphers ▸ Wikipedia articles (New!) ▸ Words that often appear near progressive-alphabet ciphers ▸ Rhymes of progressive-alphabet ciphers ▸ Invented words related to progressive-alphabet ciphers