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]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "occlude":
   bang, bar, barricade, batten, batten down, block, block up,
   blockade, bolt, button, button up, chock, choke, choke off, clap,
   clog, close, close off, close tight, close up, congest, constrict,
   contain, contract, cover, crowd, debar, dog, fasten, fold, fold up,
   jam, key, latch, lock, lock out, lock up, obstruct, pack, padlock,
   plug, plumb, seal, seal off, seal up, secure, shut, shut off,
   shut out, shut the door, shut tight, shut up, slam, snap, squeeze,
   squeeze shut, stifle, stop, stop up, stopper, strangle,
   strangulate, suffocate, zip up, zipper



The Free On-line Dictionary of Computing (30 December 2018):

occlude

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

   (1995-12-14)