The Collaborative International Dictionary of English v.0.48:

Movable \Mov"a*ble\, a. [Cf. OF. movable. See Move.]
   1. Capable of being moved, lifted, carried, drawn, turned, or
      conveyed, or in any way made to change place or posture;
      susceptible of motion; not fixed or stationary; as, a
      movable steam engine. [Also spelled moveable.]

   Syn: transferable, transferrable, transportable.
        [1913 Webster]

   2. Changing from one time to another; as, movable feasts, i.
      e., church festivals, the date of which varies from year
      to year.
      [1913 Webster]

   Movable letter (Heb. Gram.), a letter that is pronounced,
      as opposed to one that is quiescent.

   Movable feast (Ecclesiastical), a holy day that changes
      date, depending on the lunar cycle. An example of such a
      day is Easter.
      [1913 Webster +PJC]