Meaning of SPEED in English

SPEED

■ noun

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.

Phrases

at ~ quickly.

up to ~

1》 operating at full ~ or capacity.

2》 informal fully informed or up to date.

Derivatives

~er noun

Origin

OE spēd (n.), spēdan (v.), from the Gmc base of OE spōwan 'prosper, succeed'.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.