Hello Clement,
I am always grateful for a comment, thanks for taking the time to share yours. Metacognition is not a term I invented. It was a term created by neuroscientists and psychologists to describe a state of consciousness that each of us experiences. If you have a quibble with the term then you have some work to do to correct two entire disciplines.
A quick websearch comes up with lots of sources all saying roughly the same thing. Here are several from several different sources:
* "Thinking about one's own mental processes." - Collins English Dictionary
* "Awareness and understanding of one's thinking and cognitive processes; thinking about thinking." - Dictionary.com
* "Awareness or analysis of one's own learning or thought processes." - Merriam Webster's Dictionary
* "Metacognition is cognition about cognition." - Wikipedia
I could go on. Separately, as a long-term meditator I can tell you that metacognition is one of the milestones on the pathway of a serious practice. Here I am not talking about the momentary awareness that I am thinking, and what I am feeling, but a more perfect objectivity; an awareness that is non-attached. Now there's a term that is difficult to define.
Good luck with your practice!
Jason