The spelling of "more septenary" is a bit confusing. The word "more" is pronounced /mɔːr/ with the vowel sound represented by the letter "o". But the word "septenary" is pronounced /sɛpˈtɛnəri/ with the vowel sound represented by the letter "e". This is because "septenary" is derived from the Latin word "septenarius". In Latin, the vowel sound represented by the letter "e" was pronounced like the short "e" in English. Therefore, the spelling of "more septenary" reflects the word's Latin origins.