Cluster is a native Old English word from clyster (a bunch), likely related to clot and clump, that has maintained its meaning for over a thousand years.
A group of similar things or people positioned or occurring closely together.
From Old English clyster, meaning 'a bunch, cluster,' likely related to clot. The word is of uncertain deeper origin but appears to belong to a family of Germanic words involving lumping or sticking together, possibly from a Proto-Germanic root *klu- or *klut- meaning 'to clump.' Unlike many English words that arrived through French or Latin, cluster is a native Germanic survivor that has kept its form and meaning remarkably stable over a thousand years. The computing sense