 Types:
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gross margin, margin of profit, profit margin
the ratio gross profits divided by net sales

abundance
(chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million

abundance
(physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present

albedo, reflective power
the ratio of reflected to incident light

aspect ratio
the ratio of the width to the height of a tv picture

average
(sports) the ratio of successful performances to opportunities

breadth index, cephalic index, cranial index
ratio (in percent) of the maximum breadth to the maximum length of a skull

efficiency
the ratio of the output to the input of any system

facial index
the ratio (in percent) of the maximum width to the maximum height of the face

f number, focal ratio, speed, stop number
the ratio of the focal length to the diameter of a (camera) lens system

frequency, relative frequency
the ratio of the number of observations in a statistical category to the total number of observations

haematocrit, hematocrit, packed cell volume
the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit

I.Q., IQ, intelligence quotient
a measure of a person's intelligence as indicated by an intelligence test; the ratio of a person's mental age to their chronological age (multiplied by 100)

load factor
(aeronautics) the ratio of an external load to the weight of the aircraft (measured in g)

loss ratio
the ratio of the annual claims paid by an insurance company to the premiums received

Mach number
the ratio of the speed of a moving body to the speed of sound

magnification
the ratio of the size of an image to the size of the object

mechanical advantage
the ratio of the force exerted by a machine to the force applied to it

fuel consumption rate, gas mileage, gasoline mileage, mileage
the ratio of the number of miles traveled to the number of gallons of gasoline burned

betting odds, odds
the ratio by which one better's wager is greater than that of another

magnitude, order of magnitude
a number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10

outputtoinput ratio
the output power of a transducer divided by the input power

prevalence
(epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population

P/E ratio, pricetoearnings ratio
(stock market) the price of a stock divided by its earnings

productivity
(economics) the ratio of the quantity and quality of units produced to the labor per unit of time

proportionality
a ratio of two quantities that is constant

quotient
the ratio of two quantities to be divided

index of refraction, refractive index
the ratio of the velocity of light in a vacuum to that in a medium

relative humidity
the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature; expressed as a percentage

respiratory quotient
the ratio of the volume of carbon dioxide expired to the volume of oxygen consumed by an organism or cell in a given period of time

factor of safety, safety factor
the ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use

S/N, signaltonoise, signaltonoise ratio, signal/noise, signal/noise ratio
the ratio of signal intensity to noise intensity

stoichiometry
(chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers)

time constant
the ratio of the inductance of a circuit in henries to its resistance in ohms

employee turnover, turnover, turnover rate
the ratio of the number of workers that had to be replaced in a given time period to the average number of workers

loading
the ratio of the gross weight of an airplane to some factor determining its lift

eccentricity
(geometry) a ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis

proportion
the quotient obtained when the magnitude of a part is divided by the magnitude of the whole

commensurateness, correspondence, proportionateness
the relation of corresponding in degree or size or amount

batting average, hitting average
(baseball) a measure of a batter's performance; the number of base hits divided by the number of official times at bat

fielding average
(baseball) a measure of a fielder's performance; the number of assists and putouts divided by the number of chances

figure of merit
a numerical expression representing the efficiency of a given system, material, or procedure

adult intelligence
the average IQ of the adults in a given population

borderline intelligence
the minimal IQ required for someone to function normally and independently in the world (without some form of institutional assistance)

power loading
the ratio of the weight of an airplane to its engine power

span loading
the ratio of the weight of an airplane to its wingspan

wing loading
the ratio of the weight of an airplane to its wing area

incidence, relative incidence
the relative frequency of occurrence of something