Once a year; annual.
指每年一次。
宋·王安石《送吴显道》诗之五惟有春风应最惜，一年一度一归来。”
We celebrate Christmas once a year.
Learn the next connected idiom: 一年一度 (yī nián yī dù) → 度日如年 (dù rì rú nián)
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