The act of thinking about thinking; sentience(noun)
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Use "metacognition" in a sentence
"The term metacognition means thinking about thinking."
"* '' 'Excerpt:' '' .... there are two core meanings of the term metacognition to which most researchers using that label often refer: monitoring and control of cognitive processes ...."
"A potential trap of thinking about thinking - what we call metacognition - is that you can get stuck in a recursive loop where you are thinking about thinking about thinking, and so on - until it's like standing in a hall of mirrors."