“…Therefore, it is worth the effort to give this topic a treatment it deserves. This paper is a summary of my previous opinions and arguments on this topic (Wang, 1994(Wang, , 1995(Wang, , 2006a(Wang, , 2008(Wang, , 2012Wang, Liu, and Dougherty, 2018), with additional discussions to give it a more systematic and comprehensive treatment. In the following, I will start at the meta-level by discussing definitions in general, then move to the specific case of defining intelligence and AI.…”