A period of time between events or states. There was a short interval between the two acts of the play.
A space between two things; a gap. The intervals between the fence posts were evenly spaced.
In music, the difference in pitch between two notes. The musician practiced the interval of a perfect fifth on the piano.
A break or intermission, especially in a performance or sports event. The audience took a break during the interval to grab refreshments.
Mathematics: A set of real numbers that contains all real numbers lying between any two numbers of the set. The solution to the inequality is the interval [0, 5).