The correct spelling of the word "antithet" is actually "antithesis." The word is pronounced /ænˈtɪθɪsɪs/ according to the International Phonetic Alphabet (IPA). The correct spelling is important because misspelling the word may cause confusion in communication, especially in academia or professional settings. The word "antithesis" refers to the contrast or opposition between two things, ideas or concepts. As a rhetorical device, it is used to emphasize the differences between them for a more powerful effect in writing or speaking.