A source of illumination.

(transitive) To release the source code of.

(in a packet switching network) A technique whereby the sender of a packet can specify the route that a packet should take through the network.

(programming) Human-readable instructions in a programming language, to be transformed into machine instructions by a compiler, assembler or other translator, or to be carried out directly by an interpreter.

(chiefly software) Whose constituent makeup, or source code, is not made publicly available.

(linguistics, translation studies) The language from which a translation is done. / (computing) The language of the source code to be compiled.

(scholarly studies) A written commentary which discusses previously produced original work of another author, especially a notable author.

(scholarly studies) An original work, especially one by a notable author whose work is now the subject of commentaries (secondary sources).

(sciences) a source of pollution, radiation, waves, fluid or other substance that has one specific location (and negligible physical extent, distinguishing a point source from other source geometries). In simulations they can often be approximated using mathematical point sources.

plural of source code