derivation

n. /ˌderɪˈveɪʃn/ B2

起源；派生；引出

The origin or development of something, especially a word.

仙境例句

The Mock Turtle gave a silly derivation for the word lesson: lessons lessen every day.

假海龟给“功课”这个词编了一个滑稽的来历：功课一天比一天少。