日記（にっき、niっki）
- diary

日記 means "diary" or "journal" in English. It's a written record of personal experiences, thoughts, feelings, and observations. It's a place where someone can write about their daily life, significant events, or anything they wish to document. The purpose of a [日記] is usually for personal reflection, memory-keeping, or self-expression.

⚫︎ 毎日日記を書きます。 Translation: I write a diary every day. ⚫︎ 彼女は旅行の日記をつけました。 Translation: She kept a travel diary. ⚫︎ 今年の目標は日記を続けることです。 Translation: My goal this year is to keep a diary.

You use 日記 when referring to a diary or journal in general. You can talk about writing a [日記], reading someone's [日記], or keeping a [日記]. The word is generally straightforward and doesn't have many nuances in usage. When speaking, you might say, 日記をつけます (I keep a diary), 日記を読みます (I read a diary), or 日記を書きます (I write a diary).

⚫︎ The word is primarily written in kanji as 日記. ⚫︎ The reading is にっき (nikki) in hiragana. ⚫︎ There are no variations in okurigana.

There aren't many direct synonyms for 日記 in Japanese. The closest would be: ⚫︎ 手帳 (techou) - notebook/planner (can sometimes function as a diary) ⚫︎ ジャーナル (jaーnaru) - journal (loanword)

There isn't a direct antonym for 日記. However, words that describe things *not* relating to a personal written record might be considered opposite, depending on the context. For example: ⚫︎ 記録 (kiroku) - record (general record, not personal)

私は毎日日記にその日の出来事を書きます。 ・Translation: I write about the events of the day in my diary every day. ・Explanation: This sentence explains the action of writing in one's 日記.

彼女は将来のために日記を大切に保管しています。 ・Translation: She carefully keeps her diary for the future. ・Explanation: This sentence describes the preservation of the 日記, highlighting its value to the person.

The word 日記 is a combination of two kanji: 日 (nichi) meaning "day" or "sun", and 記 (ki) meaning "record" or "write down." So, 日記 literally translates to "day record" or "daily record," which accurately reflects its meaning.