(group theory) For given n and field F (especially where F is the real numbers), the group of n × n orthogonal matrices with elements in F, where the group operation is matrix multiplication.

(US, law) Any of the functionally equivalent chemical entities referenced in a Markush claim.

(countable) The method in which individuals are grouped together into families that live together. / (countable) A group of individuals who are related by blood and/or by marriage.

(business) The practice of purchasing products and services at reduced prices on the condition that a minimum number of buyers would make the purchase.

(group theory) Any group of invertible matrices over a specified field, with the group operation of matrix multiplication.

(group theory) For given n, the group of n×n unitary matrices, with the group operation of matrix multiplication.

(group theory) Any group that is isomorphic to a matrix group.

(phylogenetics) A paraphyletic group consisting of an ancestor and all its descendants, excluding the living representatives of a collection of species.

plural of family grouping

(linear algebra, group theory) For given field F and positive integer n, the group of 2n×2n symplectic matrices with elements in F.