verb (used with object), oc·clud·ed, oc·clud·ing.

  1. to close, shut, or stop up (a passage, opening, etc.).
  2. to shut in, out, or off.
  3. Physical Chemistry. (of certain metals and other solids) to incorporate (gases and other foreign substances), as by absorption or adsorption.

verb (used without object), oc·clud·ed, oc·clud·ing.

  1. Dentistry. to shut or close, with the cusps of the opposing teeth of the upper and lower jaws fitting together.
  2. Meteorology. to form an occluded front.


  1. (tr) to block or stop up (a passage or opening); obstruct
  2. (tr) to prevent the passage of
  3. (tr) chem (of a solid) to incorporate (a substance) by absorption or adsorption
  4. meteorol to form or cause to form an occluded front
  5. dentistry to produce or cause to produce occlusion, as in chewing

v.1590s, from Latin occludere (past participle occlusus) “shut up, close up,” from ob “against, up” (see ob-) + claudere “to shut, close” (see close (v.)). Of teeth, 1888 (also cf. occlusion). Related: Occluded; occluding. v.

  1. To cause to become closed; obstruct.
  2. To prevent the passage of.
  3. To bring together the upper and lower teeth in proper alignment for chewing.
  4. To enclose a virus, as in an inclusion body.
  5. In chemistry, to absorb and retain gases and other substances.

  1. To force air upward from the Earth’s surface, as when a cold front overtakes and undercuts a warm front.
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