Quadruplicate v. t. : To make fourfold; to double twice; to quadruple.

Quadruplicate a. : Fourfold; doubled twice; four times repeated; as, a quadruplicate ratio, or a quadruplicate proportion.

Quadruplicate a. : Raised to the fourth power.

Example:
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Taxonomy
quadruplicate, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, adjective, glossary, english, language, ESL, Search, dru, cate, kwä, drü, Etymology.

Defination from the web:
quadruplicate from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... existing in four corresponding or identical parts or examples <quadruplicate invoices> 2 : being the fourth of four things exactly alike ...