To provide a dictionary, a word book, a workbook, an electronic dictionary, an electronic word book, and a learning device that enable a Japanese learner to efficiently conduct repeated learning to memorize words in learning a foreign language.

To the index of a word other than a proper noun, or as an entry for description information, an abbreviation of Japanese translation in Roman character reading is added. The electronic dictionary, the electronic word book, and the learning device display words and the data of corresponding abbreviation (hereinafter, word abbreviation data) at the same time. The word abbreviation data are made editable. The learning device adds the abbreviation to the words in input text data and outputs them.