To block or stop up a passage or opening. The dentist had to occlude the cavity to prevent further decay.
To obstruct or close off a view or light. The large tree occluded the sunlight from entering the room.
To bring together the upper and lower teeth in proper alignment. The orthodontist adjusted the braces to help the teeth occlude correctly.
Of a solid or liquid, to absorb and retain (a gas, liquid, or other substance) within its structure. Palladium can occlude large volumes of hydrogen at room temperature.