According to the Spanish Royal Academy, the word occlusion is defined as the action and effect of occluding. It comes from the Latin “occlusĭo” referring to the development and conclusion of occluding. In phonetics and phonology it is attributed to the closure or narrowing that makes it impossible or complicates the passage of a fluid through a vocal tract of an articulation; or to the instantaneous closure of the articulation channel when a sound is pronounced or emitted.

In the dental environment, dental occlusion is called the contact of the teeth and the relationship between the arches and the occlusal interface; it is a system that incorporates the teeth, the joints, the muscles of the head and the neck. There are several types of dental occlusion among them are, static, is when the teeth come into contact with the jaw; the dynamics, when the jaw is in movement, here we talk about the chewing process; next is the balanced occlusion which is the contact between opposing occluding areas; the shared one that is when a tooth is missing, or had a loss; centric occurs when the teeth are at their maximum intercuspation; and finally the protected occlusion is the interaction between the two dental groups, which stop the mandibular closure.

In medicine, there is intestinal occlusion, which is the limitation or impediment of the normal course of the intestine, since compression, obturation or kinking of it occurs. In the field of psychology it is used to describe what causes a blockage in memory. And finally the term is given to the defect of a metal due to the absorption of a gas inside the metal during the solidification process.