Definition of elongation in English:


Line breaks: elong|ation
Pronunciation: /iːlɒŋˈgeɪʃ(ə)n


[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
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    • Thus, the mechanical response in the adhesion geometry can be only partially estimated since adhesion induces strong elongations in the adhesive material.
    • To ensure that stressing was proceeding as expected, the testing agency measured the tendon elongations and compared them to the calculated elongations.
    • The lower maximum load used for calculation of graft elongations assured that values would be available for all specimens.
  • 1.1An elongated part.
  • 1.2The amount of extension of an object under stress, usually expressed as a percentage of the original length.
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    • All structural metals have approximately the same ductility as measured by percentage elongation.
    • The relative amounts of elongation and spread cannot be calculated theoretically but they have been determined experimentally for mild steel.
    • Also ductility, as measured by percentage elongation, decreases.
  • 2 Astronomy 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
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    • 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 planet reaches greatest eastern elongation, 23.5 degrees from the Sun, on the 3rd.
    • On the 9th the planet is at greatest elongation from the Sun and sets around two hours after the Sun.


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

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