Interval \In"ter*val\, n. [L. intervallum; inter between + vallum a wall: cf. F. 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. (Mus.) Difference in pitch between any two tones.

At intervals, coming or happening with intervals between; now and then. ``And Miriam watch'd and dozed at intervals.'' --Tennyson.

Augmented interval (Mus.), an interval increased by half a step or half a tone.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Interval \In"ter*val\, Intervale \In"ter*vale\, n. 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. Cf. Bottom, n., 7. [Local, U. S.]

The woody intervale just beyond the marshy land. --The Century.

Source: Webster's Revised Unabridged Dictionary (1913)