This is the 195th most frequent Japanese word.
予定
"予定" means "plan" or "schedule."
予定 refers to a planned activity or schedule for tomorrow.
明日の予定は映画を見ることです。
Tomorrow's plan is to watch a movie.
予定 is used to describe a set plan or arrangement that was intended but is now canceled.
旅行の予定がキャンセルされてしまいました。
The travel plans were unfortunately canceled.
予定 represents an arrangement or scheduling of an event, which in this case is the meeting.