LATIN DICTIONARYLexicon Latīnum
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“speed” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

speed s.
festinatio: properatio (Cic.): properantia (Sall., Tac.): maturatio (Auctor ad Her.): With speed, festinanter propere; raptim; properanter; cursim; curriculo: with the utmost speed, praepropere; properantius; maturius; quam celerrime (Cic.); quam ocissume (Sall.); velis remis; remis velisque (Cic.): to make all possible speed, omni festinatione properare (Cic., Fam., 12, 25, 3); ventis remisque festinare (Cic.); nihil ad celeritatem sibi reliquum facere (Caes., B.G., 2, 26): more haste worse speed, sat celeriter fit, quicquid satis bene (Suet.); sat cito si sat bene.
speed v.
Intransitively, To hasten, festinare (to do a thing in a hurried and imperfect manner): maturare (to take care to be in good time): properare (to take care that an opportunity does not pass; Cic.): festinationem adhibere (Nep.): celeritati studere (Caes.): accelerare: currere (to make haste; Cic.): se incitare (Caes.): propere tendere: contendere aliquo (to hasten to a place; Liv.).
Transitively, To hasten, accelerare aliquid (to endeavor to bring anything about quickly): maturare aliquid, or with infinitive (not to put off anything which should be done now; but admaturare is only = to bring anything to maturity, Caes., B.G., 7, 54): repraesentare aliquid (to execute anything without delay, even before the time): praecipitare aliquid (to accelerate it too much).
To prosper, Vid.

Quick answer

What is the Latin word for speed?
The usual Latin words for “speed” are festīnātiō, properātiō, properō; also mātūrātiō, raptim, properanter. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.