Commentary: any number of entities considered as a unit
A large group walked in.
The whole group of stuffed animals were piled on the bed.
Fido's favorite musical group is called 'Cats Stink'.
WordNet 2.0 Sense Numbers: 1
Commentary: radical - two or more atoms bound together as a single unit and forming part of a molecule
Chlorine is in a chemical group called halogens.
WordNet 2.0 Sense Numbers: 2
Commentary: a set that is closed, associative, has an identity element and every element has an inverse
The group in problem five includes the numbers 7, 3, and 5.
WordNet 2.0 Sense Numbers: 3