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1. Oxford Dictionary

   elongation

   • IPA[ˌiːlɒŋˈɡeɪʃn]

   英式

   • n.
     the action or process of lengthening something；an elongated part.

   • noun: elongation, plural noun: elongations

2. • 釋義

   n.

   名詞

   • 1. the action or process of lengthening something the bird's tails become forked through elongation of their outer feathers an elongation of the crater in the impact direction
   • ▪ an elongated part.
   • ▪ the amount of extension of an object under stress, usually expressed as a percentage of the original length.
   • 2. 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