Webster's Revised Unabridged Dictionary · 1913

Interval

Interval , noun

[Latin intervallum; inter between + vallum a wall: compare French intervalle. See Wall.]

1.
A space between things; a void space intervening between any two objects; as, an interval between two houses or hills.
'Twixt host and host but narrow space was left, A dreadful interval. — Milton
2.
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.
3.
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.
4.
(Music) Difference in pitch between any two tones.
Collocations (2)
At intervals , coming or happening with intervals between; now and then. And Miriam watch'd and dozed at intervals. — Tennyson
Augmented interval (Music) , an interval increased by half a step or half a tone.

Interval , noun

A tract of low ground between hills, or along the banks of a stream, usually alluvial land, enriched by the overflowings of the river, or by fertilizing deposits of earth from the adjacent hills. Compare Bottom, n., 7. [Local, United States]
The woody intervale just beyond the marshy land. — The Century

Also: Intervale