プログレッシブ和英中辞典(第３版)の解説
はんげん【半減】
a reduction by half; a fifty percent reduction
半減する｜reduce by half
- 人員を半減する
reduce [cut back] the staff by half - 不景気で輸出が半減した
Exports were 「cut in half [halved] by the recession. - 彼のいい加減な態度を見たら熱意が半減した
His irresponsible manner dampened my enthusiasm.
半減期｜〔放射能の〕a half-life; a half-value period