Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Solar perturbation of the lunar orbit.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • obsolete 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 Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[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.]

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