夜間（やかん、yakan）
- nighttime

The Japanese word 夜間 (やかん, yakan) primarily means "nighttime," "night hours," or "night." It refers to the period of time from sunset to sunrise. It's often used in contexts related to activities, events, or restrictions that apply specifically during the hours of darkness. The word emphasizes the time of day, not just the darkness itself. 夜間 can describe a specific period of time or more generally refer to all the hours of the night.

⚫︎夜間飛行 Translation: Night flight ⚫︎夜間作業 Translation: Night work ⚫︎夜間外出禁止 Translation: Curfew; Prohibition of going out at night

⚫︎夜間 is used to specify the time of day. ⚫︎ It is frequently used in formal or official contexts. ⚫︎ It is useful when discussing operating hours, security measures, or events that take place specifically at night. ⚫︎ Often appears in notices, regulations, and announcements. ⚫︎ You can use 夜間 when talking about restricted activities or services available only during the night.

⚫︎ The word is typically written with the kanji 夜 (や, yo - night) and 間 (かん, kan - interval, time, space). ⚫︎ The reading is やかん (yakan) ⚫︎ 夜 alone is also a word, meaning "night". ⚫︎ There are no significant variations in okurigana.

⚫︎ 夜 (よ, yo): Night ⚫︎ 晩 (ばん, ban): Evening, night ⚫︎ 夜分 (やぶん, yabun): Nighttime (often used in greetings)

⚫︎ 昼間 (ひるま, hiruma): Daytime, during the day ⚫︎ 日中 (にっちゅう, nicchū): Daytime, during the day

この病院は夜間も救急患者を受け入れています。 ・Translation: This hospital accepts emergency patients even at night. ・Explanation: The sentence indicates that the hospital provides medical services during the nighttime hours.

夜間は工場の騒音に注意してください。 ・Translation: Please be mindful of the factory noise at night. ・Explanation: The sentence is a caution regarding noise levels during the night.

The word 夜間 is a combination of two kanji: 夜 (yo) meaning "night," and 間 (kan) meaning "interval" or "time." The combination literally translates to "nighttime hours" or "the time of night."