This meaning refers to a collection of elements that are organized and connected in a particular way, whether it be in terms of family lineage or organizational groups.

In this context, it signifies something that naturally follows or is a result of a previously established principle or fact.

This meaning refers to a classification based on geological or historical strata, indicating how elements are categorized over time.

Here, it pertains to a classification within biological taxonomy, where it denotes a sequential grouping of species or organisms.