invent
     v 1: come up with (an idea, plan, explanation, theory, or
          priciple) after a mental effort; "excogitate a way to
          measure the speed of light" [syn: {contrive}, {devise},
          {excogitate}, {formulate}, {forge}]
     2: make up something artificial or untrue [syn: {fabricate}, {manufacture},
         {cook up}, {make up}]
Source: WordNet® 2.0