How to say "ad" in Japanese

• アドCommon
  nounThe advertising sense: a commercial notice for a product or service, as on television, online, or in print. Use this for English 'ad' in that meaning, not for the calendar 'AD'.
• 西暦せいれきJLPT N2approx.Common
  nounThe calendar sense of 'AD': the Common Era, the Christian Era used to number years. Use it when giving a year in the Western calendar, as in dates, documents, and history writing.
• 紀元きげんCommon
  nounGlossed for 'AD (Anno Domini)', but its core sense is the starting point from which an era's years are counted. For simply dating a year as 'AD', 西暦 is the word you want.
  紀元きげん２０２０年ねんまでには、この市しの人口じんこうは倍増ばいぞうしているだろう。↗

  By the year 2020, the population of our city will have doubled.

「アド」 is the word for the advertising sense of 'ad'; 西暦 and 紀元 both relate to the calendar sense 'AD', with 西暦 the ordinary choice for dating years and 紀元 centered on an era's starting point.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• アドad
• 西暦せいれきCommon Era
• ＡＤエー・ディーAD
• 災害割増特約さいがいわりましとくやくaccidental death rider
• 紀元きげんCE (Common Era)
• ＡＤエー・ディーassistant director