うるう年
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<timefyi-glossary slug="leap-year"></timefyi-glossary>定義
365日ではなく366日ある年で、2月29日が追加される。4年ごとに訪れるが、100で割り切れても400で割り切れない年は例外（例：2000年はうるう年、1900年は違う）。