毎年|まいとしmaitoshi[0]heiban (flat)

1. adverb, nounevery year; yearly; annually
   彼かれは毎年まいとし軽井沢かるいざわへ行いく。↗

   He goes to Karuizawa every year.

• Synonym年々ねんねんNeutralYear by year, with the focus on change over time, as in 「年々増加する」; neutral register. Reach for it when describing a trend across the years.
• Synonym年ごとにとしごとにNeutralLeans toward written prose. Stresses that something recurs or progresses with each year — every year the same event comes around or advances a step.

For plain 'every year', 「毎年」 is the default. Use 「年々」 when stressing year-by-year change or a trend, and 「年ごとに」 for yearly recurrence or progression; it has a written flavor.

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

1. 連続れんぞくした各々おのおのの年とし。
2. 「一いち年ねんあたり」を示しめす単位たんい。