the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree | changing location rapidly |
the relative magnitudes of two quantities (usually expressed as a quotient) | a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression |
| a rate (usually rapid) at which something happens |
| the ratio of the focal length to the diameter of a (camera) lens system |
| distance travelled per unit time |