1. era
2. CE (Common Era); AD (Anno Domini)
  • きげん紀元
  • 2020
  • とし
  • まで
  • には
  • この
  • じんこう人口
  • ばいぞう倍増
  • している
  • だろう
  • By the year 2020, the population of our city will have doubled.
Wikipedia definition
3. Epoch (reference date)In the fields of chronology and periodization, an epoch is an instant in time chosen as the origin of a particular era. The "epoch" then serves as a reference point from which time is measured. Time measurement units are counted from the epoch so that the date and time of events can be specified unambiguously.
Read “Epoch (reference date)” on English Wikipedia
Read “紀元” on Japanese Wikipedia
Read “Epoch (reference date)” on DBpedia


to talk about this word.