This is the 1031st most frequent Korean word.
언제
"언제" means "when" in English.
This usage of '언제' refers to a broader inquiry about the most suitable time, acting as a part of a subject-question.
언제가 가장 좋은 시간인가요?
When is the best time?
Here, '언제' is utilized to ask about the timing of a planned action, namely departing.
당신은 언제 출발할 예정인가요?
When are you planning to depart?
In this sentence, '언제' is used as an adverb to inquire specifically about the time for meeting.