From The Collaborative International Dictionary of English v.0.48:

Differentiation \Dif`fer*en`ti*a"tion\, n.
   1. The act of differentiating.
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            Further investigation of the Sanskrit may lead to
            differentiation of the meaning of such of these
            roots as are real roots.              --J. Peile.
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   2. (Logic) The act of distinguishing or describing a thing,
      by giving its different, or specific difference; exact
      definition or determination.
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   3. (Biol.) The gradual formation or production of organs or
      parts by a process of evolution or development, as when
      the seed develops the root and the stem, the initial stem
      develops the leaf, branches, and flower buds; or in animal
      life, when the germ evolves the digestive and other organs
      and members, or when the animals as they advance in
      organization acquire special organs for specific purposes.
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   4. (Metaph.) The supposed act or tendency in being of every
      kind, whether organic or inorganic, to assume or produce a
      more complex structure or functions.
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