pendulation

noun3

1. •
   The act of swinging like a pendulum, as of cargo being transported by crane

   • In fact , it can be shown that a winch , which really does provide constant tension will not damp pendulation . — 1979
2. •
   Vacillation between states, especially between reliving a trauma and relaxation.

   • In trauma work, pendulation describes the process of repeatedly going in and coming out of traumatic material. — 2009
3. •
   A theory, initially proposed by H. Simroth, that the earth not only rotates on its axis and revolves around the sun, but also has a slower swinging movement like a pendulum.

   • Not only is the geographical distribution of creatures now living explained by the pendulation theory, but also the geological periods themselves. — 1908