Arranged or organized people, things, or ideas together as a cluster or collection based on something they have in common.
From Italian 'gruppo' meaning 'a cluster or knot,' possibly from Germanic roots. The word entered English in the 16th century as an artistic term before broadening to general use.
The word 'group' originally came from art—it described how painters arranged figures in a composition. Over time, it evolved to describe any collection of things together, which is why we use 'group' for everything from social groups to data groups in science.
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