(1):

(n.) A brief space of time between the recurrence of similar conditions or states; as, the interval between paroxysms of pain; intervals of sanity or delirium.

(2):

(n.) Alt. of Intervale

(3):

(n.) Difference in pitch between any two tones.

(4):

(n.) Space of time between any two points or events; as, the interval between the death of Charles I. of England, and the accession of Charles II.

(5):

(n.) A space between things; a void space intervening between any two objects; as, an interval between two houses or hills.