catena vs clustering

catena

• A series of related items. 

• A series of distinct soils arrayed along a slope. 

clustering

• A grouping of a number of similar things. 

• The undesirable contiguous grouping of elements in a hash table. 

• A prewriting technique consisting of writing ideas down on a sheet of paper around a central idea within a circle, with the related ideas radially joined to the circle using rays. 

• The grouping of a population based on ethnicity, economics or religion. 

• Forming a cluster.