txtDefinition=The acoustical distance between two {\uldb notes}{\v 89586}. Intervals are reckoned systematically; notes four steps apart are called a {\uldb \'93fourth,\'94}{\v 91666} notes five steps apart are called a {\uldb \'93fifth,\'94}{\v 91593} and so forth. Each interval has various forms, such as perfect, {\uldb major}{\v 86320}, {\uldb minor}{\v 88035}, augmented, or diminished.