quaternární

Quaternární is a Czech word that translates to "quaternary" in English. It is most commonly used in scientific contexts, particularly in chemistry and geology. In chemistry, a quaternární compound refers to a molecule where a central atom is bonded to four other atoms or groups. A prominent example is the quaternary ammonium ion, which has significant applications in various fields.

Geologically, the Quaternary period is the most recent geological period. It began approximately 2.6 million years ago and continues to the present day. This period is characterized by the repeated glaciations and deglaciations that have shaped much of Earth's surface. The Quaternary period is further divided into the Pleistocene and Holocene epochs. Human evolution and the development of modern ecosystems largely occurred during this time. The term can also be used in a broader sense to denote the fourth in a series or sequence, though this usage is less common than its scientific applications.