1. To organize or plan something. A noun or pronoun is sometimes used between "arrange" and "for," and a specific time is often given after "for." I will arrange for you two to meet this week. I need you to arrange a luncheon for the whole department. Carrie asked me to arrange a conference call for 10 AM.

2. To adapt a piece of music so that it can be played on different instruments or in a different style than is customary. A noun or pronoun can be used between "arrange" and "for" to indicate the piece of music. I would really like that piece to be played at our wedding—can you arrange it for strings? That song was arranged for the piano by our musical director.