The spelling of the word "more tertiary" is determined by its phonetic transcription. In IPA, the word is represented as /mɔːr ˈtəːʃ(ə)rɪ/ where the 'o' is pronounced as in "morning", the 'e' in "tertiary" is pronounced as in "bet" and the 'a' is pronounced as in "cat". The stress falls on the second syllable. "More tertiary" refers to something that is beyond the second level of college or education. Its correct spelling is essential for effective communication in academic contexts.