whether 2022.12.06 whetherとは 意味・定義・例文 Conjunction 接続詞 1. expressing a choice or an alternative between two or more things ~かどうか It matters whether we go or stay. 2. if it is or was true that ~が事実かどうか He asked me whether I was Japanese. 3. in either case that ~でも Whether you succeed or not, you have to do your best.