Correct spelling for the English word "hense" is [hˈɛns], [hˈɛns], [h_ˈɛ_n_s] (IPA phonetic alphabet).
The word "hence" derives from the Old English word "hēnan", which means "from here, away" or "away from this place". It is believed to have originated from the Proto-Germanic word "hinan", with similar meanings. Over time, the word underwent phonetic changes, resulting in its modern form "hence".