Correct spelling for the English word "leiter" is [lˈe͡ɪtə], [lˈeɪtə], [l_ˈeɪ_t_ə] (IPA phonetic alphabet).
The word leiter comes from German and has a cognate in English as ladder. Its etymology can be traced back to the Old High German word liasari, which meant ladder or gantry. This Old High German term was derived from the Proto-Germanic root *laizijan, ultimately originating from the Proto-Indo-European root *H1lendh-, meaning to slope or to incline. Over time, this word evolved and transformed into the modern German leiter and English ladder.