a change of position that does not entail a change of location | the act of making or doing something in return |
the act of changing location from one place to another | alternating back-and-forth movement |
the use of movements (especially of the hands) to communicate familiar or prearranged signals | mutual interaction; the activity of reciprocating or exchanging (especially information) |
a formal proposal for action made to a deliberative assembly for discussion and vote | |
a natural event that involves a change in the position or location of something | |
an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object | |
a state of change | |