elongation


Concise Oxford English Dictionary © 2008 Oxford University Press:
elongation/iːlɒŋˈɡeɪʃn/
noun
  • 1 the lengthening of something.
  • 2 Astronomy the angular separation of a planet from the sun or of a satellite from a planet.
– origin ME: from late L. elongatio(n-), from elongare (see elongate).
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