The spelling "oncunne" appears to be obsolete and its meaning is unclear. However, using IPA phonetic transcription, we can break down the spelling of this word. "Oncunne" would be pronounced as /ɒnˈkʌn/. The "o" sound is pronounced as "ah" while the "u" is pronounced as "uh". The "c" is pronounced as "k" and the double "n" indicates a nasal sound. The final "e" is likely silent. Despite its obscurity, analyzing the spelling of "oncunne" can help us understand the evolution of the English language.