The hiatus, of Latin origin (idem), is a concept that takes several uses and applications. Means hiatus succession (or meeting) of two vowels belonging to different within the same word syllables or on the border of two neighbouring words. Example: 'aorta' (a-gold-te). Given are cacophonous effect, the French language seeks to avoid in order to not to "offend" the ear, which occurs mainly in worms where the silent 'e' tends to be either elided or pronounced.
Figuratively, this term means a lag, a cut, a lack of continuity or a contradiction in a speech or in a logical or a divergence of views and opinions. In anatomy, it is a crack or any hole narrow and elongated shape. The openings of the diaphragm, for example, also say a hiatus. A hiatal hernia ("hiatal" is the adjective for any anatomical hiatus) is the opening in the diaphragm that makes the upper part of the stomach swells, as well as acid passes into the esophagus (gastroesophageal reflux disease).
With one such hernia, stomach is inserted into the chest cavity causing pain and a burning sensation (heartburn). Although the cause of this disorder is not yet clear, the experts consider that it should to a tissue debility caused by sudden physical efforts, para cough or vomiting. Smoking and obesity are among the risk factors.
Geology employs the concept of hiatus to refer to periods without sedimentation. This happens when missing sediments between two strata, for example, after which it is said that there is a hiatus.