clustering /ˈklʌstɚɪŋ/noun 4adjective 1forms 1 noun4 •A grouping of a number of similar things. •The grouping of a population based on ethnicity, economics or religion. •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. adjective1 •Forming a cluster. formsclusterings