Greek-English translations for μετάπτωση

• precession
  But as it will not do to talk entirely at random, as Montaigne does, and Ralph Waldo Emerson tries to do, we must take up some little thread or threads. and string our thoughts thereupon, keeping up also a relation among them of precession and succession.
• ablaut
• apophony
• gradation
• shift
  Just last week she bought a new shift at the market.
  Well work three shifts a day till the jobs done.
  There was a shift in the political atmosphere.