· distance travelled per unit time

Synonym(s): velocity

Hypernym(s): rate

· a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"

Synonym(s): swiftness, fastness

Hypernym(s): pace, rate

· changing location rapidly

Synonym(s): speeding, hurrying

Hypernym(s): motion, movement, move

· the ratio of the focal length to the diameter of a (camera) lens system

Synonym(s): focal_ratio, f_number, stop_number

Hypernym(s): ratio

· a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression

Synonym(s): amphetamine, pep_pill, upper

Hypernym(s): stimulant, stimulant_drug, excitant, drug_of_abuse, street_drug

· move hurridly; "He rushed down the hall to receive his guests"; "The cars raced down the street"

Synonym(s): rush, hotfoot, hasten, hie, race, pelt_along, rush_along, cannonball_along, bucket_along, belt_along, step_on_it

Hypernym(s): travel, go, move, locomote

· move faster; "The car accelerated"

Synonym(s): accelerate, speed_up, quicken

Hypernym(s): intensify, deepen

· move very fast; "The runner zipped past us at breakneck speed"

Synonym(s): travel_rapidly, hurry, zip

Hypernym(s): travel, go, move, locomote

· travel at an excessive or illegal velocity; "I got a ticket for speeding"

Hypernym(s): travel, go, move, locomote

· cause to move faster; "He accelerated the car"

Synonym(s): accelerate, speed_up

Hypernym(s): change, alter, modify