A Spark A small particle of glowing matter, either molten or on fire. A short or small burst of electrical discharge. A small, shining body, or transient light; a sparkle. (figuratively) A small amount of something, such as an idea or romanticaffection, that has the potential to become something greater, just as a spark can start a fire. Any of various lycaenid butterflies of the Indomalayan genus *Sinthusa*. (in plural sparks but treated as a singular) A ship's radio operator. (Britain, slang) An electrician. Synonyms (small particle of glowing matter): ember, gnast, funk (small amount of something, such as an idea, that has the potential to become something greater): beginnings, germ, glimmer