(mathematics) A unary function that preserves the addition operation; a unary function f such that for any x and y: f(x + y) = f(x) + f(y).

(group theory) Any (often, but not necessarily, abelian) group whose binary operation is called addition.

(mathematical analysis) The following property of a measure: that the measure of a countable union of disjoint sets is equal to the sum of their measures.

(mathematical analysis) Of a measure: that satisfies countable additivity.

(mathematical analysis) Alternative form of σ-additivity

(mathematical analysis) countable additivity

plural of additive operation

(chemistry) A form of polymerization in which copies of a monomer are repeatedly added to one end of an existing polymer

Alternative spelling of addition polymerization

(music) The practice of enlarging and revising the orchestration of an earlier work, usually a Baroque piece, to accommodate the larger contemporary orchestras and tastes of the time.