an intervening period of time: an interval of 50 years.

a period of temporary cessation; pause: intervals between the volleys of gunfire.

a space between things, points, limits, etc.; interspace: an interval of ten feet between posts.

Mathematics.

the totality of points on a line between two designated points or endpoints that may or may not be included.

any generalization of this to higher dimensions, as a rectangle with sides parallel to the coordinate axes.

the space between soldiers or units in military formation.

Music. the difference in pitch between two tones, as between two tones sounded simultaneously (harmonic interval) or between two tones sounded successively (melodic interval).

British Dictionary definitions for harmonic interval

interval

/ (ˈɪntəvəl) /

noun

the period of time marked off by or between two events, instants, etc

the distance between two points, objects, etc

a pause or interlude, as between periods of intense activity

Britisha short period between parts of a play, concert, film, etc; intermission

musicthe difference of pitch between two notes, either sounded simultaneously (harmonic interval) or in succession as in a musical part (melodic interval). An interval is calculated by counting the (inclusive) number of notes of the diatonic scale between the two notesthe interval between C and G is a fifth

the ratio of the frequencies of two sounds

mathsthe set containing all real numbers or points between two given numbers or points, called the endpoints. A closed interval includes the endpoints, but an open interval does not

at intervals

occasionally or intermittently

with spaces between

SEE MORESEE LESS

Derived Forms

intervallic (ˌɪntəˈvælɪk), adjective

Word Origin for interval

C13: from Latin intervallum, literally: space between two palisades, from inter- + vallum palisade, rampart