(mathematics) an interval in the real number line which does not contain its supremum and infimum. If specified by a pair of real numbers, then it consists of all the points on the real line whose values lie strictly between those two real numbers.

(music) an interval that is either a major second, major third, major sixth, or a major seventh

(music) the distance between notes only regarding the distance on the staff

(music) an interval that is either a unison, fourth, fifth, or an octave

(music) an interval that is either a minor second, minor third, minor sixth, or a minor seventh

(music) An interval that is increased one half step from either a major interval or a perfect interval.

(music) An interval that is decreased from either a minor interval or a perfect interval.

The difference in elevation represented by the space between adjacent contour lines

(statistics) An ordinal variable with the additional property that the magnitudes of the differences between two values are meaningful.

(mathematics) the interval [0,1], that is the set of all real numbers x such that zero is less than or equal to x and x is less than or equal to one / (telecommunications) symbol duration time.