noun (n)

• having knowledge of(noun.cognition)

  Synonym:
  awareness, cognisance, consciousness, knowingness
  Antonym:
  incognizance
  

  source: wordnet30
• range of what one can know or understand(noun.cognition)

  Synonym:
  ken
  

  source: wordnet30
• range or scope of what is perceived(noun.cognition)

  source: wordnet30
• Apprehension by the understanding; perception; observation.(noun)

  source: webster1913