Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Solar perturbation of the lunar orbit.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Modification of the lunar orbit due to the gravitational effects of the Sun.

from the GNU version of the Collaborative International Dictionary of English

  • The act of carrying up or away; exaltation.
  • An inequality of the moon's motion in its orbit, due to the attraction of the sun, by which the equation of the center is diminished at the syzygies, and increased at the quadratures by about 1° 20'.
  • The libration of the moon.

from The Century Dictionary and Cyclopedia

  • n. The act of carrying out or away; a lifting up; exaltation.
  • n. In astronomy: The second lunar inequality, described by Ptolemy.
  • n. The moon's libration.

Etymologies

Latin ēvectiō, ēvectiōn-, a going up, from ēvectus, past participle of ēvehere, to raise up : ē-, ex-, up from; see ex- + vehere, to carry; see wegh- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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