gokigen.jp/x-toiunowa-y-nokotoda-meaning-usage-x-is-y-x-means-y-in-japanese/
Grammar lesson explaining how to use XというのはYのことだ and XというのはYということだ to define words and express meaning in Japanese, with formation rules, examples, and practice exercises.
GrammarJLPT N3JLPTCasual speechJLPT N2JLPT N1AdjectivesConversationKeigo and politenessFree