#coefficient  a constant number that serves as a measure of some property or characteristic
  supertype:  #constant  a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"
  subtype:  #absorption_coefficient__coefficient_of_absorption__absorptance  a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance; the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber: "absorptance equals 1 minus transmittance"
  subtype:  #drag_coefficient__coefficient_of_drag  the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body
  subtype:  #coefficient_of_friction  the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface
  subtype:  #coefficient_of_mutual_induction__mutual_inductance  a measure of the induction between two circuits; the ratio of the electromotive force in a circuit to the corresponding change of current in a neighboring circuit; usually measured in henries
  subtype:  #coefficient_of_self_induction__self-inductance  the ratio of the electromotive force produced in a circuit by self-induction to the rate of change of current producing it, expressed in henries
  subtype:  #modulus__modulu  (physics) a coefficient that expresses how much of a specified property is possessed by a specified substance
     subtype:  #coefficient_of_elasticity__modulus_of_elasticity__elastic_modulus__elasticmodulu  (physics) the ratio of the applied stress to the change in shape of an elastic body
        subtype:  #bulk_modulus  the ratio of the change in pressure acting on a volume to the fractional change in volume
        subtype:  #modulus_of_rigidity  the coefficient of elasticity for a shearing force
        subtype:  #Young's_modulus__young'smodulu  a coefficient of elasticity applicable to the stretching of a wire
  subtype:  #coefficient_of_expansion__expansivity  the fractional change in length or area or volume per unit change in temperature at a given constant pressure
  subtype:  #coefficient_of_reflection__reflection_factor__reflectance__reflectivity  the fraction of radiant energy that is reflected from a surface
  subtype:  #transmittance__transmission  the fraction of radiant energy that passes through a substance
  subtype:  #coefficient_of_viscosity__absolute_viscosity__dynamic_viscosity__dynamicviscosity  a measure of the resistance to flow of a fluid under an applied force
  subtype:  #weighting__weight  (statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance

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