English
speedable
From speed + -able.
Formed from speed + -able
Proto-Indo-European *speh₁- ‘to prosper’
…
Proto-West Germanic *spōan ‘to succeed’
Proto-West Germanic *spōdi ‘prosperity’
Old English spēd ‘success’
Middle English sped ‘prosperity’
English speed
Today it means
adj Able to be made more efficient by means of a speedup theorem.
Sources
Sources: Wiktionary, “speedable”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / speedable