A relatively large single payment of money often paid and received instead of, or in addition to, a sequence of smaller payments.

(arithmetic) An empty sum.

(arithmetic) The result of adding no numbers, conventionally defined to equal zero.

The union of a finite sequence of surfaces taken over a disk common to every adjacent pair of the sequence, such that the boundary of the disk comprises some even number of closed arcs, disjoint except at their endpoints, which are alternatingly subarcs of the two surfaces' boundaries.

(mathematics) The vector whose initial and final points are those of a series of other vectors laid end to end.

A Chinese vegetable, a variety of Brassica rapa parachinensis subspecies, similar to bok choy but slimmer, with smooth green leaves and pale green stems, and clusters of flowers on the tips of the inner shoots

A summary.

(game theory) Pertaining to a game or situation where overall benefits to all participants can increase.

(topology) A one-point union of a family of topological spaces.

(mathematics) coproduct in some categories, like abelian groups, topological spaces or modules