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| capacitance |
in an electrical capacitor, the ratio of charge on either or both of a pair of conductors to their electrical potentials. [1/2 definitions] |
| cephalic index |
the ratio of the greatest width of a human head to its greatest length, multiplied by one hundred; cranial index. |
| colon1 |
a sign (:) used to separate numbers in ratios, as in "a ratio of 1:10," and in the writing of times of day, as in "10:23 A.M.". [1/2 definitions] |
| compression ratio |
in an internal-combustion engine, the ratio of the largest to the smallest volume of a cylinder measured at the top and bottom of the piston stroke. |
| cosine |
in trigonometry, the ratio between the length of the side next to one of the acute angles in a right triangle and the length of the hypotenuse. |
| cotangent |
in trigonometry, the ratio between the side adjacent to a given acute angle in a right triangle and the opposite side. |
| dB |
abbreviation of "decibel," or "decibels," a unit indicating the level of loudness of sound, relative to a standard level, or indicating relative differences in power levels of electrical signals, equal to ten times the common logarithm of the ratio of the two levels. |
| decibel |
a unit indicating the level of loudness of sound, relative to a standard level, or indicating relative differences in power levels of electrical signals, equal to ten times the common logarithm of the ratio of the two levels. (abbr.: dB) |
| density |
the ratio of mass to volume. [2/4 definitions] |
| efficiency |
of a machine or other physical system, the ratio of energy produced to energy supplied, usu. expressed as a percentage. [1/3 definitions] |
| exchange |
the price of one currency in terms of another, yielding a ratio at which money of one country can be exchanged for money of another country; exchange rate. [1/7 definitions] |
| exchange rate |
the price of one currency in terms of another, yielding a ratio at which money of one country can be exchanged for money of another country. |
| geometric progression |
a sequence of terms, such as 1, 4, 16, 64, 256, in which the ratio of each term to its predecessor is always the same. |
| golden section |
in mathematics and the fine arts, a relationship between two dimensions of a plane figure, or two segments of a line, such that the ratio of the smaller to the larger is the same as that of the larger to the sum of the two, or about .62 to 1.00. |
| irrational |
in mathematics, not capable of being expressed as a whole number or as a ratio of two whole numbers. [1/3 definitions] |
| load factor |
the ratio of the average load to the maximum load. [1/2 definitions] |
| Mach number |
(sometimes l.c.) the ratio of the speed of an object, or the flow of a fluid, to the speed that sound travels in the environment in which the object, or fluid, is moving; Mach. |
| magnetic moment |
the ratio that expresses the strength of a particular source of magnetic field. [1/2 definitions] |
| mechanical advantage |
the ratio of the output force exerted by a mechanism to the input force applied to it, used to rate the performance of a machine. |
| mix |
the ratio or proportion of elements that are combined. [1/8 definitions] |
| odds |
a ratio that expresses such a probability. [1/4 definitions] |
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