How to say "anniversary" in Japanese

• 年祭ねんさいCommon
  nounAn anniversary as a celebratory or ceremonial occasion — a festival or observance marking a yearly milestone — rather than the date itself. When you simply mean the date, 記念日 is the word you want.
• 記念日きねんびCommon
  nounThe general word for an anniversary as a date: the day on which a wedding, a founding, or another memorable event is commemorated. It also covers memorial and commemorative days more broadly.
  今日きょうは私達わたしたちの記念日きねんびなので、夕御飯ゆうごはんもスペシャルでいこう。↗

  Today is our anniversary so let's make this a special dinner.

Choose 記念日 for an anniversary as a date — of a wedding, a founding, or an event — and 年祭 for the anniversary as a celebratory or ceremonial occasion, a festival or observance rather than the calendar day itself.

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

• 年祭ねんさいanniversary
• 記念日きねんびmemorial day
• アニバーサリーanniversary
• 記念祭きねんさいanniversary
• アニバanniversary