the relative magnitudes of two quantities (usually expressed as a quotient)

- I.Q.
- output-to-input ratio
- mechanical advantage
- cephalic index
- prevalence
- relative humidity
- signal/noise ratio
- stop number
- S/N
- fuel consumption rate
- price-to-earnings ratio
- frequency
- factor of safety
- speed
- albedo
- breadth index
- loading
- quotient
- index of refraction
- turnover rate
- profit margin
- signal-to-noise
- IQ
- magnification
- signal/noise
- relative frequency
- f number
- stoichiometry
- mileage
- reflective power
- magnitude relation
- Mach number
- cranial index
- quantitative relation
- hematocrit
- load factor
- efficiency
- packed cell volume
- proportionality
- order of magnitude
- eccentricity
- productivity
- betting odds
- signal-to-noise ratio
- abundance
- employee turnover
- time constant
- haematocrit
- P/E ratio
- safety factor
- gross margin
- focal ratio
- average
- margin of profit
- intelligence quotient
- gasoline mileage
- odds
- magnitude
- respiratory quotient
- gas mileage
- aspect ratio
- loss ratio
- refractive index
- facial index
- turnover

the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree