txtDefinition=In {\uldb tonal}{\v 100650} music, the center of {\uldb harmonic}{\v 84040} activity, such as C {\uldb major}{\v 86320}, D {\uldb minor}{\v 88035}, and so forth. For example, in the key of C major, the major {\uldb triad}{\v 102827} built on C is the central harmony to which all other harmonies ultimately gravitate.