noun

• The process of occluding, or something that occludes.
• (medicine) Anything that obstructs or closes a vessel or canal.
• (medicine, dentistry) The alignment of the teeth when upper and lower jaws are brought together.
• (meteorology) An occluded front.
• (phonetics) A closure within the vocal tract that produces an oral stop or nasal stop.
• (physics) The absorption of a gas or liquid by a substance such as a metal.
• (computing) The blocking of the view of part of an image by another.