WordNet
trimester
名詞
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三半期
a period of three months; especially one of the three three-month periods into which human pregnancy is divided.
3ヶ月間。特に人間の妊娠期間が分けられる3つの3ヵ月の期間の一つ。
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三半期
one of three divisions of an academic year.
学年の3分の1。