Interval may refer to: Interval (mathematics), a range of numbers (formally, a subset of an ordered set) Interval measurements or interval variables in statistics's a level of measurement Interval (music), the relationship between two notes Interval (time), the duration between two events Space-time interval, the distance between two points in 4-space Playing time (cricket) Interval training, in sports,'s a training technique often used by runners Interval Research Corporation, a defunct… (More on Intervals)