The word 'UNTIL' is an adverb which means up to the time of or before a certain point. The spelling 'UNTILL' with an extra 'L' is incorrect. The correct spelling follows the IPA transcription: /ʌnˈtɪl/. The phonetic transcription here indicates that there is no 'L' sound in the word until. It is a common mistake to include an extra 'L' in the spelling, which can be easily corrected by remembering the correct transcription /ʌnˈtɪl/.