These two words may be technical terms used by eg psychologists or philosophers, but I have never heard or read them in my life. Clive
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I know this is a very late reply, but for anyone still curious, I also would have thought the adjective to describe an entity with metacognition would be "metacognizant." However, an article by Joële Proust ("Metacognition" published in October 2010) uses the word metacognitive instead.