A group or bunch of several discrete items that are close to each other. A number of individuals grouped together or collected in one place; a crowd; a mob. A group of galaxies or stars that appear near each other. A sequence of two or more words that occur in language with high frequency but are not idiomatic; a chunk, bundle, or lexical bundle. A secundal chord of three or more notes. A group of consonants. A group of computers that work together. A logical data storage unit containing one or more physical sectors (see block). A significant subset within a population. Set of bombs or mines. A small metal design that indicates that a medal has been awarded to the same person before. Euphemism of clusterfuck. An ensemble of bound atoms or molecules, intermediate in size between a molecule and a bulk solid.

To form a cluster or group. To collect into clusters. To cover with clusters.