"Anniverse" is not a commonly known word. The spelling of the word is based on combining "anniversary" and "universe." The IPA phonetic transcription for "Anniverse" would be /ænɪˈvɜrs/ - pronounced "an-e-verce." The origin of the word was likely an attempt to create a unique and catchy term for a cosmic anniversary. However, it is not widely used, and the more common term continues to be "anniversary" to commemorate milestones in a person or entity's life.