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• margin of profit, profit margin, gross margin go
  the ratio gross profits divided by net sales
  
• abundance go
  (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust
  
• abundance go
  (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 go
  the ratio of reflected to incident light
  
• aspect ratio go
  the ratio of the width to the height of a tv picture
  
• average go
  (sports) the ratio of successful performances to opportunities
  
• cephalic index, breadth index, cranial index go
  ratio (in percent) of the maximum breadth to the maximum length of a skull
  
• efficiency go
  the ratio of the output to the input of any system
  
• facial index go
  the ratio (in percent) of the maximum width to the maximum height of the face
  
• speed, focal ratio, f number, stop number go
  the ratio of the focal length to the diameter of a (camera) lens system
  
• frequency, relative frequency go
  the ratio of the number of observations in a statistical category to the total number of observations
  
• hematocrit, haematocrit, packed cell volume go
  the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit
  
• intelligence quotient, IQ, I.Q. go
  a measure of a person's intelligence as indicated by an intelligence test
  
• load factor go
  (aeronautics) the ratio of an external load to the weight of the aircraft (measured in g)
  
• loss ratio go
  the ratio of the annual claims paid by an insurance company to the premiums received
  
• Mach number go
  the ratio of the speed of a moving body to the speed of sound
  
• magnification go
  the ratio of the size of an image to the size of the object
  
• mechanical advantage go
  the ratio of the force exerted by a machine to the force applied to it
  
• mileage, fuel consumption rate, gasoline mileage, gas mileage go
  the ratio of the number of miles traveled to the number of gallons of gasoline burned
  
• odds, betting odds go
  the ratio by which one better's wager is greater than that of another
  
• magnitude, order of magnitude go
  a number assigned to the ratio of two quantities
  
• output-to-input ratio go
  the output power of a transducer divided by the input power
  
• prevalence go
  (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
  
• price-to-earnings ratio, P/E ratio go
  (stock market) the price of a stock divided by its earnings
  
• productivity go
  (economics) the ratio of the quantity and quality of units produced to the labor per unit of time
  
• proportionality go
  a ratio of two quantities that is constant
  
• quotient go
  the ratio of two quantities to be divided
  
• refractive index, index of refraction go
  the ratio of the velocity of light in a vacuum to that in a medium
  
• relative humidity go
  the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature
  
• respiratory quotient go
  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
  
• safety factor, factor of safety go
  the ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use
  
• signal-to-noise ratio, signal-to-noise, signal/noise ratio, signal/noise, S/N go
  the ratio of signal intensity to noise intensity
  
• stoichiometry go
  (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 go
  the ratio of the inductance of a circuit in henries to its resistance in ohms
  
• turnover, employee turnover, turnover rate go
  the ratio of the number of workers that had to be replaced in a given time period to the average number of workers
  
• loading go
  the ratio of the gross weight of an airplane to some factor determining its lift
  
• eccentricity go
  (geometry) a ratio describing the shape of a conic section