イェイFreq.FrequencyTop 20,000Meanings1interjectionyayCasual exclamation of joy or celebration, borrowed from English 'yay'.イェイ!テストに合ごう格かくした!Yay! I passed the test!プレゼントをもらって、子こ供どもたちは「イェイ!」と叫さけんだ。The children shouted 'Yay!' when they got their presents.