invent (
http://definr.com/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]