Pronunciation respelling is a notation used to convey the pronunciation of words, in a language, such as English, which does not have a phonemic orthography.
There are two basic types of pronunciation respelling:
As an example, the last name of actor Jake Gyllenhaal, written /ˈdʒɪlənhɔːl/ in the IPA, might be written jĭl′·ən·hôl or JIL-ən-hawl in a phonemic system, and Jill-in-hall in a non-phonemic system.
Pronunciation respelling systems for English have been developed primarily for use in dictionaries. They are used there because it is not possible to predict with certainty the sound of a written English word from its spelling or the spelling of a spoken English word from its sound. So readers looking up an unfamiliar word in a dictionary may find, on seeing the pronunciation respelling, that the word is in fact already known to them orally. By the same token, those who hear an unfamiliar spoken word may see several possible matches in a dictionary and must rely on the pronunciation respellings to find the correct match.
Traditional respelling systems for English use only the 26 ordinary letters of the Latin alphabet with diacritics, and are meant to be easy for native readers to understand. English dictionaries have used various such respelling systems to convey phonemic representations of the spoken word since Samuel Johnson published his Dictionary of the English Language in 1755. Today, such systems remain in use in American dictionaries for native English speakers, but they have been replaced by the International Phonetic Alphabet (IPA) in linguistics references and many bilingual dictionaries published outside the United States.