whole step       
noun [ C ]  biology US specialized uk/ˈhəʊl ˌstep/ us/ˈhoʊl ˌstep/ (UK tone)
 (音乐)全音
the largest difference in pitch between two notes that are next to each other in the western musical scale
  The interval from G to A is a whole step. 从 G 到 A 的音程是一个全音。 
 Compare: half step