interval

n. [ L. intervallum; inter between + vallum a wall: cf. F. intervalle. See Wall. ] [ 1913 Webster ]

1. A space between things; a void space intervening between any two objects; as, an interval between two houses or hills. [ 1913 Webster ]

'Twixt host and host but narrow space was left,
A dreadful interval. Milton. [ 1913 Webster ]

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. [ 1913 Webster ]

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. [ 1913 Webster ]

4. (Mus.) Difference in pitch between any two tones. [ 1913 Webster ]

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.

{ } 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. ] [ 1913 Webster ]

The woody intervale just beyond the marshy land. The Century. [ 1913 Webster ]