noun. 
                    The rate or a measure of the rate of motion, especially.
                  
                
                  
                    noun. 
                    Distance traveled divided by the time of travel.
                  
                
                  
                    noun. 
                    The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time.
                  
                
                  
                    noun. 
                    The magnitude of a velocity.
                  
                
                  
                    noun. 
                    Swiftness of action.
                  
                
                  
                    noun. 
                    undefined
                  
                
                  
                    noun. 
                    The act of moving rapidly.
                  
                
                  
                    noun. 
                    The state of being in rapid motion; rapidity.
                  
                
                  
                    noun. 
                    A transmission gear or set of gears in a motor vehicle.
                  
                
                  
                    noun. 
                    undefined
                  
                
                  
                    noun. 
                    A numerical expression of the sensitivity of a photographic film, plate, or paper to light.
                  
                
                  
                    noun. 
                    The capacity of a lens to accumulate light at an appropriate aperture.
                  
                
                  
                    noun. 
                    The length of time required or permitted for a camera shutter to open and admit light.
                  
                
                  
                    noun. 
                    A stimulant drug, especially amphetamine or methamphetamine.
                  
                
                  
                    noun. 
                    One that suits or appeals to a person's inclinations, skills, or character.
                  
                
                  
                    noun. 
                    Prosperity; luck.
                  
                
                  
                    intransitive verb. 
                    undefined
                  
                
                  
                    intransitive verb. 
                    To go, move, or proceed quickly.
                  
                
                  
                    intransitive verb. 
                    To drive at a speed exceeding a legal limit.
                  
                
                  
                    intransitive verb. 
                    To pass quickly.
                  
                
                  
                    intransitive verb. 
                    To move, work, or happen at a faster rate; accelerate.
                  
                
                  
                    intransitive verb. 
                    To be under the influence of a stimulant drug.
                  
                
                  
                    intransitive verb. 
                    undefined
                  
                
                  
                    intransitive verb. 
                    To prove successful; prosper.
                  
                
                  
                    intransitive verb. 
                    To get along in a specified manner; fare.
                  
                
                  
                    intransitive verb. 
                    To cause to move or proceed quickly; hasten.
                  
                
                  
                    intransitive verb. 
                    To increase the speed or rate of; accelerate. Often used with up:
                  
                
                  
                    intransitive verb. 
                    To further, promote, or expedite (a legal action, for example).
                  
                
                  
                    intransitive verb. 
                    To help to succeed or prosper; aid.
                  
                
                  
                    idiom. 
                    undefined
                  
                
                  
                    idiom. 
                    (up to speed)  Operating at maximum speed.
                  
                
                  
                    idiom. 
                    (up to speed)  Producing something or performing at an acceptable rate or level.
                  
                
                  
                    idiom. 
                    (up to speed)  Fully informed; conversant.