DERIVATION Meaning of DERIVATION in English der ‧ i ‧ va ‧ tion AC /ˌderəˈveɪʃ ə n, ˌderɪˈveɪʃ ə n/ BrE AmE noun [countable,uncountable +of] technical the origin of something, especially a word Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012