the creation of something in the mind

a creation (a new device or process) resulting from study and experimentation

the act of inventing

http://wordnetweb.princeton.edu/perl/webwn?s=invention&sub=Search+WordNet&o2=&o0=1&o8=1&o1=1&o7=&o5=&o9=&o6=&o3=&o4=&h=