紀元前（きげんぜん、kigenzeん）
- BC

The Japanese word 紀元前 (きげんぜん) translates to "B.C." or "Before Christ" in English. It refers to the time period before the birth of Jesus Christ, which is used as the starting point for the Gregorian calendar (the most widely used calendar in the world). The term is primarily used when discussing historical events and dates. It is essential for understanding historical timelines and the chronological order of events.

⚫︎紀元前500年にギリシャで民主主義が発展しました。 Translation: Democracy developed in Greece in 500 B.C. ⚫︎エジプトのピラミッドは紀元前2500年頃に建設されました。 Translation: The pyramids of Egypt were built around 2500 B.C.

紀元前 is used in formal and informal contexts when referring to dates and events occurring before the year 1. It is always used in conjunction with a specific year, such as 紀元前 1000 or 紀元前 300. It is important to remember that larger numbers represent earlier dates.

⚫︎The word is typically written in kanji 紀元前. ⚫︎The reading is きげんぜん in hiragana. ⚫︎There is only one standard way to write this word.

There are no direct Japanese synonyms for 紀元前. The concept is expressed using the term itself, as it is a direct borrowing from the Western calendar system.

⚫︎The antonym of 紀元前 is 西暦 (せいれき), which means "A.D." or "Anno Domini" (in the year of the Lord), referring to the years after the birth of Jesus Christ.

カエサルは紀元前100年に生まれました。 ・Translation: Caesar was born in 100 B.C. ・Explanation: This sentence uses 紀元前 to specify the year of Caesar's birth before the common era.

紀元前 30年にクレオパトラが亡くなりました。 ・Translation: Cleopatra died in 30 B.C. ・Explanation: This sentence tells the year Cleopatra died before the common era, using 紀元前.

The term 紀元 (きげん) means "era" or "epoch" and 前 (ぜん) means "before." Therefore, 紀元前 literally translates to "before the era." This era is defined by the birth of Jesus Christ in the Western calendar system. The term is a direct translation/borrowing from the concept used in the West.