say it: IN-tur-vuhl
interval is a noun meaning "a definite length of time marked off by two instants". It carries 4 recorded senses.
a definite length of time marked off by two instants
a set containing all points (or all real numbers) between two given endpoints
the distance between things
“fragile items require separation and cushioning”
the difference in pitch between two notes
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for interval come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.