Usage patterns 〈 事こと 〉 に 一いち 年ねん かかる it takes a year to do something
This research took a year.
一いち 年ねん が 過す ぎる a year passes
A year passed in the blink of an eye.
一いち 年ねん に 〈 数かず 〉 回かい X times a year
I go on a trip twice a year.
一いち 年ねん を 振ふ り 返かえ る to look back on the year
I look back on the year at the end of December.
Related words 一年 is a standalone noun meaning 'one year', while 年間 is a suffix that attaches to a number to mean 'over a period of ~ years', as in 三年間 .
一年 is the everyday word for 'one year', whereas 一カ年 is a stiffer, formal variant with the same meaning used in official reports and contracts.
一年 is a general term for 'one year' that can mean a calendar year or a duration, while 一年間 specifically stresses the length of a one-year period.
Word family· 11 all year round; throughout the year
one year ago; a year ago
one year and a half; a year and a half
first anniversary of a person's death
first-year ice
Show 6 more Show fewer Written forms 一年
いちねん
Standard kanji spelling for the common reading いちねん .
ひととし
Rare literary or archaic reading for 'one year'.
ひととせ
Archaic reading for 'one year', found in classical poetry and old texts.
1年
ひととし
ひととせ
Etymology Compound of 一 (いち , 'one') and 年 (ねん , 'year'). The readings ひととし and ひととせ are native Japanese readings of the same kanji, now largely obsolete.
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