interval
n
1 the period of time marked off by or between two events, instants, etc.
2 the distance between two points, objects, etc.
3 a pause or interlude, as between periods of intense activity
4 (Brit) a short period between parts of a play, concert, film, etc.; intermission
5 (Music) the 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 notes
the interval between C and G is a fifth
6 the ratio of the frequencies of two sounds
a the 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
b the set of points in n-dimensional space where coordinates satisfy the inequalities ai <leeq> xi <leeq> bi (closed interval) or ai <lab> xi <lab> bi (open interval) where ai <lab> bi
a occasionally or intermittently
b with spaces between (C13: from Latin intervallum, literally: space between two palisades, from inter- + vallum palisade, rampart) ♦
intervallic adj
class interval
n (Statistics) one of the intervals into which the range of a variable of a distribution is divided, esp. one of the divisions of the base line of a bar chart or histogram
confidence interval
n (Statistics) an interval of values bounded by confidence limits within which the true value of a population parameter is stated to lie with a specified probability
contour interval
n the difference in altitude represented by the space between two contour lines on a map
interval estimate
n (Statistics) an interval within which the true value of a parameter of a population is stated to lie with a predetermined probability on the basis of sampling statistics
Compare →
point estimate
interval scale
n (Statistics) a scale of measurement of data according to which the differences between values can be quantified in absolute but not relative terms and for which any zero is merely arbitrary: for instance, dates are measured on an interval scale since differences can be measured in years, but no sense can be given to a ratio of times
Compare →
ordinal scale →
ratio scale →
nominal scale
interval signal
n a characteristic snatch of music, chimes, etc., transmitted as an identifying signal by a radio station between programme items
interval training
n a method of athletic training using alternate sprinting and jogging, (Also called)
fartlek
lunitidal interval
n the difference in time between the moon crossing a meridian and the following high tide at that meridian