An advocacy group.

An organised group of people who use various forms of advocacy to influence public opinion and policy.

An advocacy group.

(phylogenetics) The living representatives of a collection of species, together with their ancestors back to their most recent common ancestor as well as all of that ancestor's descendants.

(physics) A mathematical apparatus that allows systematic investigation of the changes of a physical system as viewed at different distance scales.

plural of free group

plural of group action

An encounter group or similar group therapy method.

(algebra) The largest sporadic group, of order 2⁴⁶ · 3²⁰ · 5⁹ · 7⁶ · 11² · 13³ · 17 · 19 · 23 · 29 · 31 · 41 · 47 · 59 · 71 (approximately 8 · 10⁵³), denoted M or F₁.

a group that forms only a small part of the population, whether it be for ethnic or other reasons.