plural of additive identity

(number theory) The subfield of number theory concerning the behaviour of sumsets (integer sets added to each other elementwise).

(mathematical analysis) countable additivity

(mathematical analysis) Alternative form of σ-additivity

(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.

Alternative spelling of addition polymerization

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

(chemistry) a reaction in which radicals are added to both sides of a double or triple bond

(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.

(chemistry) A calibration technique for quantification that involves adding known amounts of a substance to an aliquot of an analyte.