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

plural of unitary group

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

(Internet) A group of people who meet and chat online, especially in a chat room

plural of orthogonal group

(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.

plural of family grouping

(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.

(Internet) An online discussion group.

plural of e-group