first class, top grade, foremost, top-notch
Example sentences
彼は音楽家としては一流ではない。
He's not in the top grade as a musician.
一流大学でも楽に入学できたろうに、専門学校に進んだ。
He would have been able to enter a good university easily if he had tried, but he entered a vocational school instead.
彼は一流歌手として認められた。
He was recognized as a first-class singer.