group

Group stands for:

social group , in sociology and psychology usually a group of 3 people or more with direct and mutual relationships
Group (fire brigade) , tactical basic unit
Group (military) , military sub-unit or association
Organizational element in the authority hierarchy, see subdivision
Group (Parliament) , amalgamation of several MPs
Group , colloquially for a music group, see band (music)
Group , part of the German police force, see Einsatzhundschaft #Gruppe
Group , immobile group of actors, while the curtain falls, see Tableau vivant #Definition
Group , group-like group of companies, see financial conglomerate

scientific, technical:

Group (math) , set of elements together with a link
Group (botany) , summary of cultivars according to characteristics
Group (geology) , rock unit
Group , subunit of a molecule, see functional group
Group , column in the periodic table of the elements, see group of the periodic table
Group (Greek vase painting) , summary based on the style of drawing in ancient Greek vases
Group , complete set of components in bicycle technology, see bicycle components

geographically:

Group is the family name of the following people:

Otto Gruppe (1851–1921), German classical philologist and high school teacher
Otto Friedrich Gruppe , pseudonym Absolutus von Hegelingen (1804–1876), German philosopher, classical philologist and publicist
Werner Gruppe (1920–2009), German agricultural scientist

See also:

Wiktionary: Group - explanations of meanings, word origins, synonyms, translations