"group" in the noun sense
1. group, grouping
any number of entities (members) considered as a unit
2. group, radical, chemical group
chemistry) two or more atoms bound together as a single unit and forming part of a molecule
3. group, mathematical group
a set that is closed, associative, has an identity element and every element has an inverse
"group" in the verb sense
arrange into a group or groups
"Can you group these shapes together?"
2. group, aggroup
form a group or group together
Source: WordNet® (An amazing lexical database of English)
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