Etymology
Advertisement

Words related to accelerate

ad- 

word-forming element expressing direction toward or in addition to, from Latin ad "to, toward" in space or time; "with regard to, in relation to," as a prefix, sometimes merely emphatic, from PIE root *ad- "to, near, at."

Simplified to a- before sc-, sp- and st-; modified to ac- before many consonants and then re-spelled af-, ag-, al-, etc., in conformity with the following consonant (as in affection, aggression). Also compare ap- (1).

In Old French, reduced to a- in all cases (an evolution already underway in Merovingian Latin), but written forms in French were refashioned after Latin in 14c. and English did likewise 15c. in words it had picked up from Old French. In many cases pronunciation followed the shift. Over-correction at the end of the Middle Ages in French and then English "restored" the -d- or a doubled consonant to some words that never had it (accursed, afford). The process went further in England than in France, where the vernacular sometimes resisted the pedantic, resulting in English adjourn, advance, address, advertisement (Modern French ajourner, avancer, adresser, avertissement). In modern word-formation sometimes ad- and ab- are regarded as opposites, but this was not in classical Latin.

Advertisement
celerity (n.)

"swiftness, rapidity of motion," late 15c., from Old French celeritee (14c., Modern French célérité), from Latin celeritatem (nominative celeritas) "swiftness," from celer "swift," from PIE *keli- "speeding" (source also of Sanskrit carati "goes," Greek keles "fast horse or ship," Lithuanian šuoliai "a gallop," Old High German scelo "stallion").

accelerando (adv.)

musical instruction indicating a passage to be played with gradually increasing speed, 1842, from Italian accelerando, present participle of accelerare, from Latin accelerare "to hasten, quicken" (see accelerate).

accelerant (n.)
Origin and meaning of accelerant
"that which hastens," especially combustion, 1854, from Latin accelerantem (nominative accelerans), present participle of accelerare "to hasten, quicken" (see accelerate). As an adjective from 1890.
accelerator (n.)
1610s, "a hastener," from Latin accelerator, agent noun from accelerare "to hasten; make haste" (see accelerate). Motor vehicle sense of "pedal which operates the throttle and thus modulates engine speed" is from 1900; particle physics sense is from 1931.