How to say "millennium" in Japanese

• ミレニアムCommon
  nounThe common loanword for the general sense of 'millennium': a period of one thousand years, as in the turn of the millennium. This is the word you want in most everyday contexts.
• 千年紀せんねんき
  nounThe Sino-Japanese equivalent for a millennium as a stretch of one thousand years, the kind of term found in historical dating and chronology; less common than the loanword.
• 至福千年しふくせんねん
  nounA specialized religious term for the millennium as a coming thousand years of supreme happiness or bliss; not used for ordinary thousand-year spans, and rarely the word you want outside religious discussion.
• 千年王国せんねんおうこく
  nounSpecifically the religious sense: the millennial kingdom of Christ, the thousand-year reign prophesied in Christian scripture. Use it only in that religious context, never for a millennium as a mere length of time.
• 千載せんざい
  nounMeans 'a thousand years' and, by extension, perpetuity or eternity; for the ordinary sense of 'millennium' as a period it is seldom the word you want.

Use 「ミレニアム」 for the ordinary thousand-year period and 千年紀 in historical dating; 千年王国 and 至福千年 are religious; 千載, less common, leans toward 'eternity'.

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

• ミレニアムmillennium
• 千年紀せんねんきmillennium
• 至福千年しふくせんねんmillennium
• 千年王国せんねんおうこくmillennium
• 千載せんざいthousand years
• 千年せんねんthousand years
• 千歳ちとせthousand years