e

noun

1. 1

   the 5th letter of the Roman alphabet

2. 2

   the cardinal compass point that is at 90 degrees

3. 3

   the base of the natural system of logarithms; approximately equal to 2.718282...

4. 4

   a radioactive transuranic element produced by bombarding plutonium with neutrons

5. 5

   a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body