This is the 743rd most frequent Japanese word.
練習
Practice.
In this sentence, '練習' refers to regularly practicing a skill, in this case, piano-playing.
毎日ピアノの練習をしています。
I practice the piano every day.
Here, '練習' indicates preparation through practice before an event, a sports match in this context.
試合の前に練習をたくさんしました。
I practiced a lot before the match.
In this usage, '練習' refers to a specific practice session, which is an organized event.