1.
previous day, day before
The day immediately before a particular event or date. Often used to describe preparations or events occurring the day before something important.
試験の前日は早く寝た方がいい。
You should go to bed early the day before the exam.
結婚式の前日に準備をした。
I made preparations the day before the wedding.
前日までにご連絡ください。
Please contact us by the day before.
旅行の前日に荷物をまとめておいた。
I packed my luggage the day before the trip.
大会の前日は緊張してあまり眠れなかった。
I was nervous the day before the tournament and couldn't sleep much.
前日 means "the day before" a specific referenced event or date. Unlike 昨日 (yesterday), which is relative to today, 前日 is relative to a particular occasion.
DISTINCTION:
- 前日: the day before [an event] — used in narratives and formal contexts
- 昨日: yesterday — relative to the present moment
COMMON PATTERNS:
- 〜の前日: the day before ~
- 前日までに: by the day before
- 前日に準備する: to prepare the day before
REGISTER:
Slightly formal. Common in written text, announcements, and narratives. In casual speech, people might say 前の日 instead.
RELATED TIME EXPRESSIONS:
- 翌日: the following day
- 当日: the day itself
- 前夜: the previous night/evening