From Citizendium, the Citizens' Compendium
- Group (mathematics): Set with a binary associative operation such that the operation admits an identity element and each element of the set has an inverse element for the operation.
- Group (chemistry): Add brief definition or description
- Social group: Three or more persons who interact with one another regularly, hold expectations and obligations as members of the group, and share a common identity.
- Dog group: An official category under the auspices of a kennel club, a group comprises many individual dog breeds.