Definition of "precessional" [pre•ces•sion•al]

• Of or pertaining to precession (adjective)

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• "Thus astronomers must have made great progress in their science before they could select as a day for counting from, the epoch when the slow reeling motion of the earth (the so-called precessional motion) brought the Pleiades centrally south, at noon, at the time of the vernal equinox."
• "When these blades rotate they create large gyroscopic forces sometimes called precessional forces."
• "In his Galactic Alignment theory, John Major Jenkins describes the coming 2012 event as the "precessional convergence of Milky Way and solstice sun.""