interval

nouns

a definite length of time marked off by two instants
interval, time interval
a set containing all points (or all real numbers) between two given endpoints
interval
is a type of (narrower)
(mathematics) an abstract collection of numbers or symbols
"the set of prime numbers is infinite"
set
the distance between things
"fragile items require separation and cushioning"
interval, separation
the difference in pitch between two notes
interval, musical interval