The correct spelling of the word "more decennial" is /mɔːr dɪˈsɛniəl/. It refers to something that happens once every ten years or that lasts for ten years. The first part, "more," means "occurring again or continuing for a long time," while "decennial" comes from the Latin word "decennium," meaning decade. Knowing the IPA phonetic transcription can aid in correctly pronouncing and spelling words that may have unfamiliar sounds, as well as improving overall communication skills.