(combinatorics) A subset of a group such that any element of the group can be expressed as the difference (or the quotient) of two elements in such subset.

(set theory) Any set X such that for any x ∈ X, if y ∈ x then y ∈ X; equivalently, such that if x ∈ X and x is not an urelement then x ⊆ X.

The china or other ware used for serving and eating breakfast.

plural of set theory

(mathematics) A family of sets sharing no elements in common; sets whose intersection is the empty set.

Alternative spelling of dead set

Alternative spelling of dead set

(hunting) The rigid pose a hunting dog assumes when pointing out game to a hunter. / A fixed or stationary condition arising from obstacle or hindrance; a deadlock.

Unswervingly dedicated; resolutely determined. / (Australia, colloquial) Complete and utter; total.

(idiomatic, transitive) To write. / (transitive) To fix; to establish; to ordain.