Speeding has a divided etymological history: The gerund/participle of speed + -ing; speed descends from Old English spēd ('success, swiftness'), from Proto-Germanic *spōdiz. The historical chain includes Old English spēd and Proto-Germanic *spōdiz. Older glosses in the chain include "success, swiftness", which help explain the semantic range of the modern word. Morphologically, speeding is best read as compound, suffixal formation, and borrowing, yielding an English noun and adjective shaped by both form history and later usage. In current English it functions as a noun and adjective, with the sense "the act of driving faster than the legal limit". related forms include speed, speedy, and speedily. The result is an English noun and adjective whose etymology preserves the older forms while supporting the word's specialized modern meaning.