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sci·ence  audio  (sns) KEY 

    1. The observation, identification, description, experimental investigation, and theoretical explanation of phenomena.
    2. Such activities restricted to a class of natural phenomena.
    3. Such activities applied to an object of inquiry or study.
  1. Methodological activity, discipline, or study: I've got packing a suitcase down to a science.
  2. An activity that appears to require study and method: the science of purchasing.
  3. Knowledge, especially that gained through experience.
  4. Science Christian Science.

Middle English, knowledge, learning, from Old French, from Latin scientia, from scins, scient- present participle of scre, to know; see skei- in Indo-European roots

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