(mathematics) The group of all affine transformations of a finite-dimensional vector space.

(mathematics) the set of rigid motions that are also affine transformations.

(chemistry) In the periodic table of the elements, any of the eight groups (columns) of elements that contain the lightest (and most common) elements.

A group of people who informally support each other over a problem which all members share.

plural of support group

(mineralogy) A large group of silicate minerals having a silicon to oxygen ratio of 1:2. This group includes many silicates of sodium, potassium, calcium, and aluminum in an open network structure.

(physics, mathematics) The group of all Lorentz transformations in spacetime.

A group of people joined temporarily to accomplish some task or take part in some organised collective action. / (US military) A component of a naval task force.

In chemistry, a group of elements with related properties similar to that of platinum, notably high resistance to chemical activity, particularly oxidation and reaction with acids. The platinum group consists of the elements ruthenium, rhodium, palladium, osmium, iridium, and platinum. In the periodic table of the elements they are in period 5 or 6 and in groups 8, 9 or 10.

A form of polygynous, polyandrous marriage in which more than one man and more than one woman form a family unit.