1. [n]  position 11 in a countable series of things
2. [adj]  coming next after the tenth and just before the twelfth in position

ELEVENTH is a 8 letter word that starts with E.

1. \E*lev"enth\, a. [Cf. AS. endlyfta. See {Eleven}.]
   1. Next after the tenth; as, the eleventh chapter.
   
   2. Constituting one of eleven parts into which a thing is
      divided; as, the eleventh part of a thing.
   
   3. (Mus.) Of or pertaining to the interval of the octave and
      the fourth.
   
   

2. \E*lev"enth\, n.
   1. The quotient of a unit divided by eleven; one of eleven
      equal parts.
   
   2. (Mus.) The interval consisting of ten conjunct degrees;
      the interval made up of an octave and a fourth.