Dominant Scale Degree
From “The Dominant: The 6th Scale Degree¨ in Music Theory for Electronic Music Producers
For more on “perfect¨ intervals, see 20240901171406-Musical_Intervals.
The last part of the quote suggests that, with the dominant, the scale sounds as it if its suspended in time. That is to say, there is a lot of potential held in the playing of the dominant scale degree.
So, for example, for the C Major scale, the fifth scale degree would be G:

major_scale music music_theory scale_degree
bibliography
- “The Dominant: The 5th Scale Degree.” In Music Theory for Electronic Music Producers: The Producer’s Guide to Harmony, Chord Progressions, and Song Structure in the MIDI Grid., 1st ed., 63. Minneapolis, MN: Slam Academy, 2018.