1. With relatively high volume
   "the band played loudly"; "she spoke loudly and angrily";
   - loud, aloud
    
2. In manner that attracts attention
   "The protesters spoke loudly against the new policy";
   - obstreperously, clamorously
    
3. Used as a direction in music; to be played relatively loudly
   "The chorus sang the final verse loudly, bringing the piece to a powerful conclusion";
   - forte

Encyclopedia: Loudly