plural of working group

plural of additive group

plural of neighbouring group

plural of action group

plural of quotient group

plural of alternating group

(group theory) A group obtained from a larger group by aggregating elements via an equivalence relation that preserves group structure.

A rank in the RAF, between that of wing commander and air commodore, equivalent to an army colonel

(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.