The Collaborative International Dictionary of English v.0.48:

Occlude \Oc*clude"\, v. t. [L. occludere, occlusum; ob (see
   Ob-) + claudere to shut.]
   1. To shut up; to close. --Sir T. Browne.
      [1913 Webster]

   2. (Chem.) To take in and retain; to absorb; -- said
      especially with respect to gases; as, iron, platinum, and
      palladium occlude large volumes of hydrogen.
      [1913 Webster]

WordNet (r) 3.0 (2006):

occlude
    v 1: block passage through; "obstruct the path" [syn:
         obstruct, obturate, impede, occlude, jam,
         block, close up] [ant: disengage, free]

The Free On-line Dictionary of Computing (19 January 2023):

occlude

    (Or "shadow") To make a variable inaccessible by
   declaring another with the same name within the scope of the
   first.

   (1995-12-14)