前日（ぜんじつ、zenjitsu）
- previous day

The Japanese word 前日 (ぜんじつ, zenjitsu) means "the day before," "the previous day," or "the day prior." It refers to the day immediately preceding a specific date or event. It can also be used figuratively to refer to an earlier stage or time before a significant change or event.

⚫︎結婚式の前日］は、とても緊張しました。 Translation: I was very nervous on the day before the wedding. ⚫︎試験の前日］は、しっかり復習しましょう。 Translation: Let's review thoroughly on the day before the exam. ⚫︎プロジェクトの成功のために、前日］から準備を始めました。 Translation: We started preparing from the day before for the success of the project.

⚫︎You can use 前日 in various contexts, such as planning, reporting past events, or discussing preparations. ⚫︎It's used when you want to specifically refer to the day before something else. ⚫︎It is often used when discussing appointments, events, or important dates.

⚫︎The word 前日 is typically written with the kanji 前 (ぜん, mae - front, previous) and 日 (にち, hi - day, sun). ⚫︎The reading is ぜんじつ (zenjitsu) in hiragana. ⚫︎There are no significant variations in writing or okurigana for this word.

⚫︎前々日 (ぜんぜんび, zenzenbi) - Two days before. ⚫︎昨日 (きのう, kinou) - Yesterday (though this focuses more on the past than the day before a specific event). ⚫︎一昨日 (おととい, ototoi) - The day before yesterday.

⚫︎当日 (とうじつ, toujitsu) - The day of. ⚫︎翌日 (よくじつ, yokujitsu) - The next day. ⚫︎翌々日 (よくよくじつ, yokuyokujitsu) - The day after tomorrow.

旅行の前日］に、持ち物のリストを作りました。 ・Translation: On the day before the trip, I made a list of things to bring. ・Explanation: This sentence uses 前日 to specify when the list was created, which was the day immediately preceding the trip.

重要なプレゼンテーションの前日］は、練習を重ねました。 ・Translation: I practiced repeatedly on the day before the important presentation. ・Explanation: This sentence uses 前日 to indicate the day dedicated to rehearsing for the upcoming presentation.

The word 前日 is formed by combining the kanji 前 (mae), meaning "before" or "previous," and 日 (hi/nichi), meaning "day." Therefore, the etymology directly reflects its meaning: the day before a specific point in time.