fill-in

== English == === Etymology === From the verb phrase fill in. === Noun === fill-in (plural fill-ins) A temporary replacement for another, especially at a job. A substitution. (mathematics) An intermediate result that must be stored temporarily during the course of a sparse matrix computation. A question or puzzle in which one is expected to fill in a missing part of something. (music) A musical embellishment (usually percussion) that is added to connect musical phrases. Something added to fill a gap. Something added to increase the size of something; padding or filler. (marketing) A product category that is used to complete a range or variety of a product line. === Anagrams === in-fill, infill