Appointment
Noun, する verb, and の adjective
よやく
パーマとカットの予約をしたいんですけど。
Could I make an appointment for a haircut and a perm?
2020年に日本へ行くなら早めに予約した方がいいですよ。その年は東京オリンピックがありますから。
If you're planning to go to Japan in 2020, you'd better book early because that's the year of the Tokyo Olympics.
ただ今、コウイチのサイン入りブロマイドの先行予約を受け付けております。予約された方の中から抽選で三名の方にコウイチのファンミーティングinハワイのVIPチケットをプレゼントいたします。皆様どしどしご応募ください！
We are currently accepting advance reservations for Koichi's picture with his autograph. Among the people who made a reservation, we will offer three of you VIP tickets for Koichi's fan meeting in Hawaii. Please don't wait to reserve your spot!
A beforehand promise is a promise you've made beforehand. This is a reservation or appointment. Makes sense, right?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.