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Definition of Rosetta stone
1. Noun. A part of an inscribed granite stela that was originally about six feet tall and was set up in 196 BC; the inscriptions in hieroglyphics and Demotic and Greek gave the first clues to the decipherment of Egyptian hieroglyphics.
Definition of Rosetta stone
1. Proper noun. A large inscribed stone found near Rosetta, Egypt, in 1799; later used as a basis for understanding many previously undecipherable examples of hieroglyphic writing. ¹
2. Proper noun. (qualifier hence) Any source of information crucial to interpreting. ¹
¹ Source: wiktionary.com