The first meaning of the term bitterness mentioned in the dictionary of the Royal Spanish Academy (RAE) refers to the taste that is perceived as bitter: similar to gall. This type of flavor, if it is very intense, is not very pleasant. Bitterness is detected by the taste buds found in the posterior region of the tongue.

Monophony is a musical texture formed by a single melodic line. It is equivalent, therefore, to the monodia: the singing of a single person, without any harmonic accompaniment. If two or more voices sing the same melody simultaneously, there is also talk of monophony. In this case the voices and even the musical instruments develop the melody in question, either in unison or at a distance not greater than one octave.

Macabre is a term derived from the French macabre. It is an adjective that alludes to the horrific death and the rejection it causes. The macabre, therefore, is linked to the most repulsive issues of death. For example: "The agency offers a macabre tour of places where the most cruel murders were committed", "The young man devised a macabre plan to get rid of his wife and children", "Macabre find: found four human skulls within a bag" .

Fasting, originating in the Latin word ieiunium, is the act and consequence of fasting. This verb (fasting), meanwhile, refers to giving up, either partially or totally, to ingesting drinks and / or food for a certain period of time. Fasts can be carried out for different reasons.

The concept of vertex derives from the Latin word vertex. From the perspective of geometry, the vertex is the name that receives the point that marks the union between the segments that originate an angle or where a minimum of three planes merges. The cusp of a cone or a pyramid is also known as a vertex, as is the maximum or minimum point of a curved line.

The highest authority of an aboriginal community is called chieftain. The concept arose in the Taíno groups that lived in the Antilles. With the Spanish colonization of the American continent, the notion began to be used with reference to all indigenous leaders. For example: "When the Europeans arrived, they were received by the chieftain", "Tomorrow there will be a meeting of chiefs of the different indigenous reserves of the region", "The inhabitants of the community are accustomed to go to the chieftain before the police "