n.1 an intervening time or space.
2 Brit. a pause or break, esp. between the parts of a theatrical or musical performance.
3 the difference in pitch between two sounds.
4 the distance between persons or things in respect of qualities.
Phrases and idioms:
at intervals here and there; now and then.
Etymology: ME ult. f. L intervallum space between ramparts, interval (as INTER-, vallum rampart)