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From: WordNet (r) 2.0

 E
      n 1: a fat-soluble vitamin that is essential for normal
           reproduction; an important antioxidant that neutralizes
           free radicals in the body [syn: vitamin E, tocopherol]
      2: a radioactive transuranic element produced by bombarding
         plutonium with neutrons [syn: einsteinium, Es, atomic
         number 99]
      3: the cardinal compass point that is at 90 degrees [syn: east,
          due east]
      4: the base of the natural system of logarithms [syn: 2.718282...]
      5: the 5th letter of the Roman alphabet