Meaning of SPEED in English
1》 the rate at which someone or something moves or operates or is able to move or operate.
↘rapidity of movement or action.
2》 each of the possible gear ratios of a bicycle or ( US ) of a motor vehicle.
3》 the light-gathering power or f-number of a camera lens.
↘the duration of a photographic exposure.
↘the sensitivity of photographic film to light.
4》 informal an amphetamine drug, especially methamphetamine.
5》 archaic success; prosperity.
■ verb ( past and past participle sped )
1》 move quickly.
↘( ~ up ) move or work more quickly.
↘ (also ~ something up ) cause to happen more quickly.
2》 (of a motorist) travel at a ~ greater than the legal limit.
3》 informal take or be under the influence of an amphetamine drug.
4》 archaic make prosperous or successful.
at ~ quickly.
up to ~
1》 operating at full ~ or capacity.
2》 informal fully informed or up to date.
OE spēd (n.), spēdan (v.), from the Gmc base of OE spōwan 'prosper, succeed'.
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004