曜日（ようび、youbi）
- day of the week

The Japanese word 曜日 (ようび) means "day of the week". It specifically refers to the seven days of the week: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday. It's a fundamental concept in the Japanese language, used frequently in daily conversations and written communication.

⚫︎今日は何曜日ですか。 Translation: What day of the week is it today? ⚫︎金曜日に映画を見に行きます。 Translation: I will go to see a movie on Friday. ⚫︎来週の月曜日に会議があります。 Translation: There is a meeting next Monday.

曜日 is used to specify a particular day of the week. You can use it in various contexts, such as: ⚫︎Talking about schedules: "The class is on Tuesday." ⚫︎Making plans: "Let's meet on Saturday." ⚫︎Asking about the date: "What day is the meeting?" When referring to a specific day of the week, the word 曜日 always comes *after* the day. For example, 月曜日 is Monday, 火曜日 is Tuesday, and so on.

⚫︎The word is typically written with the kanji 曜日 (ようび). ⚫︎The reading is written in hiragana as ようび. ⚫︎There is only one way to write the okurigana, which is び.

There are no direct synonyms for 曜日 in the sense of another word meaning "day of the week". However, you can use related words when describing time. ⚫︎日 (にち - day) is a general term for a day. ⚫︎週 (しゅう - week) refers to a period of seven days.

There are no direct antonyms for 曜日. It is a specific time unit.

月曜日はいつも忙しいです。 ・Translation: I am always busy on Mondays. ・Explanation: This sentence expresses the frequency of being busy on Mondays, utilizing the term 月曜日 (getsuyoubi) for "Monday."

明日は水曜日で、テストがあります。 ・Translation: Tomorrow is Wednesday, and I have a test. ・Explanation: This sentence tells us what day it is and that a test is planned for Wednesday, using 水曜日 (suiyoubi) for Wednesday.

The word 曜日 is a compound word. ⚫︎曜 (you) means "day of the week" or "planet". It is derived from the names of celestial bodies associated with the days of the week in ancient East Asian astronomy. ⚫︎日 (bi) is a suffix indicating "day". Therefore, 曜日 literally means "day of the week" and originally referred to the days named after the planets (Sun, Moon, and the five visible planets).