Definition of elongation in English:



mass noun
  • 1The action or process of lengthening something.

    ‘the bird's tails become forked through elongation of their outer feathers’
    count noun ‘an elongation of the crater in the impact direction’
    • ‘The main difference in that study was the elongation of the tendons that were not surgically treated.’
    • ‘The development of a leaf involves a complex pattern of cell division and cell elongation, with cell elongation playing a central part in the expansion of the leaf blade.’
    • ‘We found no evidence that the tip rotates during elongation.’
    • ‘The lower maximum load used for calculation of graft elongations assured that values would be available for all specimens.’
    • ‘When that process happens, elongation of the hypocotyl, the embryonic stem, stops.’
    • ‘In paralyzable detectors, a photon reaching the detector during the dead-time leads to an elongation of the dead-time period.’
    • ‘Thus, the mechanical response in the adhesion geometry can be only partially estimated since adhesion induces strong elongations in the adhesive material.’
    • ‘The first step of longitudinal fission is the elongation of the body, causing the central tissues to experience stretch.’
    • ‘To some degree, of course, this reflects simply the elongation of the body of the animal, but more prominently it represents the primary growth of the gastrointestinal tract itself.’
    • ‘In this case, however, shell inflation and posterior elongation of the aperture should be linked with each other, or the pattern of the aperture map must change considerably during ontogeny.’
    • ‘Generally, with the elongation of the sidechain, the conformation change is significant and accompanied interaction variation is remarkable.’
    • ‘Oberneder insists this is critical for getting true benefits from the motion, because when a muscle is stretched, its immediate reflex is to tighten up against the elongation.’
    • ‘Dr Ewen believed he had established that something in the GM potato had caused elongation of a section of the stomach.’
    • ‘Some of the most frequent gross morphological adaptations to an aquatic lifestyle include the modifications of limbs into paddles and the elongation and lateral flattening of the tail.’
    • ‘When mannerism dominated, there was also an emphasis on decoration inspired by animals, plants, and other themes that lent themselves to the elongation and distortion then prevalent.’
    • ‘Both the computational and analytical models make mechanistic assumptions and do not explicitly deal with processes such as translational elongation.’
    • ‘To ensure that stressing was proceeding as expected, the testing agency measured the tendon elongations and compared them to the calculated elongations.’
    • ‘It initially depends on the orientation of the bud on its axis, and is modified by the growth direction of the apex during elongation.’
    • ‘Another metabolite-specific effect seen in this work was hypocotyl thickening and elongation.’
    • ‘We have shown that our experimental setup permits facile measurements of the angle between two tethers and of the force exerted by one tether during the process of tube elongation until coalescence.’
    enlargement, increase in size, swelling, distension, dilation
    View synonyms
    1. 1.1 An elongated part.
    2. 1.2 The amount of extension of an object under stress, usually expressed as a percentage of the original length.
      • ‘As-cast tensile strengths as high as 800 MPa and elongations of 15 to 20% can be obtained readily in sand castings, and slightly higher values in centrifugal castings.’
      • ‘Lead may be added to the lower-strength manganese bronzes to increase machinability, but at the expense of decreased tensile strength and elongation.’
      • ‘Also ductility, as measured by percentage elongation, decreases.’
      • ‘The product in mind has a tensile elongation of 20% to 30%, which is a good quality in a concrete coating.’
      • ‘It is shown that tensile elongations between 150 and 200 percent can be obtained with all alloys under the appropriate conditions of temperature and strain rate.’
      • ‘However, austenitic steels possess very good ductility with elongations of about 50% in tensile tests.’
      • ‘Fine-grained Ti - 6% Al - 4% V sheet can be superplastically formed, giving very high elongations, tight radii and negligible springback.’
      • ‘The modulus is represented by the op line, the tensile strength by et, and the tensile elongation by oe.’
      • ‘Actone offers excellent flexibility, kink resistance, and torqueability as well as good pushability, a higher break load, and lower elongation.’
      • ‘Some researches gave specific attention to cooling rate effects and increased tensile elongations obtained with slower cooling rates.’
      • ‘All structural metals have approximately the same ductility as measured by percentage elongation.’
      • ‘Parts made from this material replicate polypropylene tensile strength and elongation at yield, and stuck in the elongation direction.’
      • ‘The relative amounts of elongation and spread cannot be calculated theoretically but they have been determined experimentally for mild steel.’
      • ‘The increase in gauge length related to the original length times 100 is the percentage of elongation.’
      • ‘By one treatment, the tensile strength and elongation may be substantially raised.’
      protractedness, lengthiness, extent, extensiveness
      View synonyms
  • 2Astronomy
    The angular separation of a planet from the sun or of a satellite from a planet, as seen by an observer.

    ‘Mercury reaches greatest elongation on the 1st, when it will be 27 degrees west of the Sun’
    • ‘Furthermore, any resonance with the Earth is illusory in that Mercury is not well placed for observations except during its brief greatest elongations near its aphelion.’
    • ‘The Sun keeps a tight rein on Mercury this month because the planet's greatest elongation falls on the day before its perihelion, when it is physically closest to the Sun.’
    • ‘On the 9th the planet is at greatest elongation from the Sun and sets around two hours after the Sun.’
    • ‘The planet attains its greatest elongation as early as June 8.’
    • ‘The planet reaches greatest eastern elongation, 23.5 degrees from the Sun, on the 3rd.’


Late Middle English: from late Latin elongatio(n-), from elongare ‘place at a distance’ (see elongate).