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

  • n. The time that elapses between successive new moons, averaging 29 days, 12 hours, 44 minutes; a lunar month.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a month of approximately 29.53 days, measured from a lunar phase until the return of that same phase. On average, the number of days between Full Moons is about 29.5306 days. The actual number of days may differ from the average number by more than a half day. From one Full Moon to the next, the number of days in one lunation can vary between 29.272 and 29.833 days.
  • n. The irregular period from one new moon until the next.

from the GNU version of the Collaborative International Dictionary of English

  • n. The period of a synodic revolution of the moon, or the time from one new moon to the next; varying in length, at different times, from about 291/4 to 295/6 days, the average length being 29 d., 12h., 44m., 2.9s.

from The Century Dictionary and Cyclopedia

  • n. The period of a synodic revolution of the moon, or the time from one new moon to the next.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the period between successive new moons (29.531 days)


Middle English lunacioun, from Medieval Latin lūnātiō, lūnātiōn-, from Latin lūna; see lunar.
(American Heritage® Dictionary of the English Language, Fourth Edition)
from lunar (Wiktionary)


  • This process is called lunation, and it is akin to the Moon bowing slightly as it dances around us, watching us all the while.

    Rambles at » Blog Archive » Nightmarish lunation

  • As it had now been discovered that the exact length of the lunation is a little more than twenty-nine and a half days, it became necessary to abandon the alternate succession of full and deficient months; and, in order to preserve a more accurate correspondence between the civil month and the lunation, Meton divided the cycle into 125 full months of thirty days, and 110 deficient months of twenty-nine days each.

    Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

  • (In fact, you may need to look at the free online manual just to understand terms like "lunation" and "Astronomical Julian date.")

    PC World

  • A lunation trine to Uranus in your 5th house demands that you hurl yourself into the fray, grab the spotlight, and express yourself.

    November Horoscope

  • Rambles at » Blog Archive » Nightmarish lunation

    Rambles at » Blog Archive » Nightmarish lunation

  • And there is not the moon seen in all the lunation, save only the second quarter.

    The Travels of Sir John Mandeville

  • On land, meridional, a bispherical moon, revealed in imperfect varying phases of lunation through the posterior interstice of the imperfectly occluded skirt of a carnose negligent perambulating female, a pillar of the cloud by day.


  • She had taken only four days to pass from syzygy to quadrature, and it was consequently evident that she would be visible for little more than a week at a time, and that her lunation would be accomplished within sixteen days.

    Off on a Comet

  • We just received word that the Mrav and Grost systems were vaporized within the past lunation.


  • It had taken the better part of a lunation to get them all cleaned out*

    Spock Must Die


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