(noun) the (usually elliptical) path described by one celestial body in its revolution about another
(noun) the path of an electron around the nucleus of an atom
Definitions for Change
(noun) the act, process , or result of making different
(noun) the frequent and usually sudden passing from one condition to another
(noun) something (as pieces of stamped metal or printed paper) customarily and legally used as a medium of exchange , a measure of value, or a means of payment