From Latin territorialĭum, territory is the portion of land area that belongs to a city, a province, a region, a country, etc. The concept is also used to name the land that controls or owns an organization or a person. National, on the other hand, is what belongs to or relative to a nation (the constituent sovereignty of a State or the human community whose members share cultural characteristics in common).

The concept of teratogenesis is not part of the dictionary of the Royal Spanish Academy (RAE), although the publication does recognize the term teratogenic. It is an adjective that qualifies what causes a deformation or an abnormality in the fetus. However, that does not prevent us from knowing its etymological origin.

Crusade is a term with several meanings. Next we will explain the most important. The concept is used to refer to military expeditions that, between the end of the 11th and 13th centuries, were carried out by Christians to regain control of the Holy Land. They received this name because the soldiers who fought wore a cross made of cloth that they used as a badge on their clothes to distinguish themselves from the enemies.

The concept of hue has several uses. The first meaning recognized by the Royal Spanish Academy (RAE) in its dictionary refers to a feature that is not too noticeable but that gives a certain character to something. The notion is often used to mention the variations or degrees that an element can exhibit.

The Aztec concept is used in different ways and often leads to confusion. According to the detailed in the dictionary of the Royal Spanish Academy (RAE), the term comes from aztécatl, a concept of the Nahuatl language that mentions the inhabitants of Aztlán. Aztlán, on the other hand, is called the mythical site that is considered the origin of the Aztatecas or Mexicas.

Oligophrenia is known as a mental deficiency. This term, according to experts, finds its origin in a word of the Greek language that is translated into Spanish as "little mind." Oligophrenic syndrome is the denomination that, decades ago, allowed to name the pathology characterized by a serious deficiency of the mental area born as a result of the cessation of the progress and progress of intelligence during the intrauterine stage or in the first years of life (at this point it is contemplated until the age of 18).