noun (n)

• the act of making and recording a measurement(noun.act)

  source: wordnet30
• the act of observing; taking a patient look(noun.act)

  Synonym:
  observance, watching
  

  source: wordnet30
• a remark expressing careful consideration(noun.communication)

  Synonym:
  reflection, reflexion
  

  source: wordnet30
• facts learned by observing(noun.cognition)

  Example:
  He reported his observations to the mayor.
  

  source: wordnet30
• the act of noticing or paying attention(noun.cognition)

  Synonym:
  notice, observance
  

  source: wordnet30
• The act or the faculty of observing or taking notice; the act of seeing, or of fixing the mind upon, anything.(noun)

  source: webster1913