a change of position that does not entail a change of location | changing location rapidly |
the act of changing location from one place to another | a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression |
the use of movements (especially of the hands) to communicate familiar or prearranged signals | a rate (usually rapid) at which something happens |
a formal proposal for action made to a deliberative assembly for discussion and vote | the ratio of the focal length to the diameter of a (camera) lens system |
a natural event that involves a change in the position or location of something | distance travelled per unit time |
an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object | |
a state of change | |