 Types:
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acceleration
(physics) a rate of increase of velocity

deceleration
(physics) a rate of decrease in velocity

attrition rate, rate of attrition
the rate of shrinkage in size or number

birth rate, birthrate, fertility, fertility rate, natality
the ratio of live births in an area to the population of that area; expressed per 1000 population per year

bits per second, bps
(computer science) the rate at which data is transferred (as by a modem)

crime rate
the ratio of crimes in an area to the population of that area; expressed per 1000 population per year

data rate
the rate at which circuits or other devices operate when handling digital information

death rate, deathrate, fatality rate, mortality, mortality rate
the ratio of deaths in an area to the population of that area; expressed per 1000 per year

dose rate
the quantity of radiation absorbed per unit time

ESR, erythrocyte sedimentation rate, sed rate, sedimentation rate
the rate at which red blood cells settle out in a tube of blood under standardized conditions; a high rate usually indicates the presence of inflammation

flow, flow rate, rate of flow
the amount of fluid that flows in a given time

flux
the rate of flow of energy or particles across a given surface

frequence, frequency, oftenness
the number of occurrences within a given time period

GHz, Gc, gigacycle, gigacycle per second, gigahertz
1,000,000,000 periods per second

growth rate, rate of growth
the rate of increase in size per unit time

Hz, cps, cycle, cycle per second, cycles/second, hertz
the unit of frequency; one hertz has a periodic interval of one second

inflation rate, rate of inflation
the rate of change of prices (as indicated by a price index) calculated on a monthly or annual basis

jerk
(mechanics) the rate of change of acceleration

kHz, kc, kilocycle, kilocycle per second, kilohertz
one thousand periods per second

kilometers per hour, kilometres per hour, km/h, kph
the ratio of the distance traveled (in kilometers) to the time spent traveling (in hours)

MHz, Mc, megacycle, megacycle per second, megahertz
one million periods per second

THz, terahertz
one trillion periods per second

metabolic rate
rate of metabolism; the amount of energy expended in a give period

miles per hour, mph
the ratio of the distance traveled (in miles) to the time spent traveling (in hours)

gait, pace
the rate of moving (especially walking or running)

heart rate, pulse, pulse rate
the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health

rate of return
the amount returned per unit of time expressed as a percentage of the cost

rate of respiration, respiratory rate
the rate at which a person inhales and exhales; usually measured to obtain a quick evaluation of a person's health

rev, revolutions per minute, rpm
rate of revolution of a motor

sampling rate
(telecommunication) the frequency of sampling per unit time

solar constant
the rate at which radiant solar energy is received at the outer layer of the earth's atmosphere

spacing
the time between occurrences of a repeating event

speed, velocity
distance travelled per unit time

pace, tempo
the rate of some repeating event

words per minute, wpm
the rate at which words are produced (as in speaking or typing)

audio, audio frequency
an audible acoustic wave frequency

radio frequency
an electromagnetic wave frequency between audio and infrared

infrared, infrared frequency
the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range

angular acceleration
(physics) the rate of change of the angular velocity of a rotating body

angular velocity
(physics) the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute

BMR, basal metabolic rate
the rate at which heat is produced by an individual in a resting state

wave number
the reciprocal of the wavelength of a wave

centripetal acceleration
the acceleration toward the center that holds a satellite in elliptical orbit

cardiac output
the amount of blood pumped out by the ventricles in a given period of time

isometry
the growth rates in different parts of a growing organism are the same

femoral pulse
pulse of the femoral artery (felt in the groin)

radial pulse
pulse of the radial artery (felt in the wrist)

ROI, return on invested capital, return on investment
(corporate finance) the amount, expressed as a percentage, that is earned on a company's total capital calculated by dividing the total capital into earnings before interest, taxes, or dividends are paid

Nyquist rate
(telecommunication) the lowest sampling rate that will permit accurate reconstruction of a sampled analog signal

quick time
a normal marching pace of 120 steps per minute

double time
a fast marching pace (180 steps/min) or slow jog

airspeed
the speed of an aircraft relative to the air in which it is flying

escape velocity
the minimum velocity needed to escape a gravitational field

groundspeed
the speed of an aircraft relative to the ground

hypervelocity
excessive velocity

muzzle velocity
the velocity of a projectile as it leaves the muzzle of a gun

peculiar velocity
velocity with respect to the local standard of rest

radial velocity
velocity along the line of sight toward or away from the observer

c, light speed, speed of light
the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second

steerageway
(nautical) the minimum rate of motion needed for a vessel to be maneuvered

terminal velocity
the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity

attendance
the frequency with which a person is present

count per minute, counts/minute
frequency per minute

sampling frequency
(telecommunication) the frequency of sampling a continuously varying signal

infant deathrate, infant mortality, infant mortality rate
the death rate during the first year of life

neonatal mortality, neonatal mortality rate
the death rate during the first 28 days of life

M.M., beats per minute, bpm, metronome marking
the pace of music measured by the number of beats occurring in 60 seconds

channel capacity
the maximum data rate that can be attained over a given channel

neutron flux
the rate of flow of neutrons; the number of neutrons passing through a unit area in unit time

radiant flux
the rate of flow of radiant energy (electromagnetic waves)