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Longman Dictionary of Contemporary English
prolongation
noun
EXAMPLES FROM CORPUS
▪ Anticipations and extensions are optional components of prolongation regions; when either exists they are weak components relative to the arrival.
▪ Clytemnestra let out an unearthly keening howl, her lips snarling back and her tail a stiff prolongation of her backbone.
▪ From the literature it is not clear whether prolongation of therapy beyond four months yield a higher response rate.
▪ The preoperative radiotherapy did not result in a significant prolongation of survival time.
▪ The unit of prolongation is the prolongational region.
▪ They are really a southern prolongation of Ponta de São Lourenço.
The Collaborative International Dictionary
Prolongation

Prolongation \Pro`lon*ga"tion\, n. [F. prolongation.]

  1. The act of lengthening in space or in time; extension; protraction.
    --Bacon.

  2. That which forms an additional length.

Douglas Harper's Etymology Dictionary
prolongation

late 14c., from Old French prolongation (14c.), from Late Lation prolongationem (nominative prolongatio), noun of action from past participle stem of Latin prolongare (see prolong).

Wiktionary
prolongation

n. 1 The act of prolonging. 2 That which has been prolonged; an extension.

WordNet
prolongation
  1. n. the act of prolonging something; "there was an indefinite prolongation of the peace talks" [syn: protraction, perpetuation, lengthening]

  2. amount or degree or range to which something extends; "the wire has an extension of 50 feet" [syn: extension, lengthiness]

  3. the consequence of being lengthened in duration [syn: lengthiness, continuation, protraction]

Wikipedia
Prolongation

In music theory, prolongation is the process in tonal music through which a pitch, interval, or consonant triad is able to govern spans of music when not physically sounding. It is a central principle in the music-analytic methodology of Schenkerian analysis, conceived by Austrian theorist Heinrich Schenker.

Prolongation can be thought of as a way of generating musical content through the linear elaboration of simple and basic tonal structures with progressively increasing detail and sophistication. Important to the operation of prolongation is the hierarchical differentiation of pitches within a passage of tonal music. Typically, the note or harmony of highest hierarchical significance is the tonic, and this is said to be "prolonged" across durations of music that may feature many other different harmonies. (However, in principle any other type of consonant chord, pitch, or harmonic function can be prolonged within tonal music.) Conversely, in a chord progression, harmonies are said to prolong a triad when they are subordinated to that governing chord in a systematic manner; the job of such prolonging harmonies is to express and extend the influence of that hierarchically super-ordinate pitch or triad. Because it enables a pitch or pitches to remain in effect over the course of a piece, even as many other harmonic events intervene, prolongation is central to the concept of tonality in music.

Usage examples of "prolongation".

Seen from this height, the lake appeared to be on the same level as the ocean, but, on reflection, the engineer explained to his companions that the altitude of this little sheet of water must be about three hundred feet, because the plateau, which was its basin, was but a prolongation of the coast.

Either Hitler must invade and conquer England, or he must face an indefinite prolongation of the war, with all its incalculable hazards and complications.

Harding advanced towards the enormous causeway whose prolongation enclosed the narrow Shark Gulf.

The Western Culture is suffering from disease, and the prolongation of this disease is the prolonging of Chinese conditions in Europe.

Anything can be done once or for a short time, but custom, repetition, prolongation, is always to be avoided when possible in war.

Naturally the prolongation and severity of the fighting in Athens with E.

Having regard to what I had said in the autumn of 1944, I had the feeling that we ought to ask the electors to approve by a referendum, or in some other way, this limited but reasonable prolongation of our tenure.

The prolongation of the German war made it impossible to send the British and British-Indian divisions which you needed, and a good many other units on which you were counting had to be retained in the decisive European theatre.

For the fortunate class there was more comfort, better health, increased stature, a prolongation of youth, and a system of technical knowledge so vast and intricate that no man could know more than its outline or some tiny corner of its detail.

A noticeable circumstance, however, was the prolongation of the period of recovery at these high temperatures.

In connection with this it must be remembered that greater strain consequent on heightened response has a general tendency to a prolongation of the period of recovery.

Thus the longer a wire is stimulated, the more and more overstrained it becomes, and it therefore requires a gradual prolongation of the interval between the successive stimuli, if recovery is to be complete.

This reagent not only diminishes the excitability, but causes a very great prolongation of the period of recovery.

By the action of some the latent period is diminished, others produce a prolongation of the period of recovery.

Java and its eastern prolongation of islands is nothing else but the outward limit of the circumfluent ocean.