What is "incorporeal hereditament"

Incorporeal \In`cor*po"re*al\, a. [Pref. in- not + corporeal: cf. L. incorporeus. Cf. Incorporal.]

1. Not corporeal; not having a material body or form; not consisting of matter; immaterial.

   Thus incorporeal spirits to smaller forms Reduced their shapes immense.
   --Milton.

   Sense and perception must necessarily proceed from some incorporeal substance within us.
   --Bentley.

2. (Law) Existing only in contemplation of law; not capable of actual visible seizin or possession; not being an object of sense; intangible; -- opposed to corporeal.

   Incorporeal hereditament. See under Hereditament.

   Syn: Immaterial; unsubstantial; bodiless; spiritual.