What does "immovable" mean?

Additional senses

1. 2.Not capable of being affected or moved in feeling or by sympathy; unimpressible; impassive. Dryden.
2. 3.(Law.) Not liable to be removed; permanent in place or tenure; fixed; as, an immovable estate. See Immovable, n. Blackstone. Immovable apparatus (Med.), an appliance, like the plaster of paris bandage, which keeps fractured parts firmly in place. -- Immovable feasts (Eccl.), feasts which occur on a certain day of the year and do not depend on the date of Easter; as, Christmas, the Epiphany, etc.
3. 4.That which can not be moved.
4. 5.pl. (Civil Law) Lands and things adherent thereto by nature, as trees; by the hand of man, as buildings and their accessories; by their destination, as seeds, plants, manure, etc.; or by the objects to which they are applied, as servitudes. Ayliffe. Bouvier.