The Collaborative International Dictionary of English v.0.48:

Easement \Ease"ment\, n. [OF. aisement. See Ease, n.]
   1. That which gives ease, relief, or assistance; convenience;
      accommodation.
      [1913 Webster]

            In need of every kind of relief and easement.
                                                  --Burke.
      [1913 Webster]

   2. (Law) A liberty, privilege, or advantage, which one
      proprietor has in the estate of another proprietor,
      distinct from the ownership of the soil, as a way, water
      course, etc. It is a species of what the civil law calls
      servitude. --Kent.
      [1913 Webster]

   3. (Arch.) A curved member instead of an abrupt change of
      direction, as in a baseboard, hand rail, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

easement
    n 1: (law) the privilege of using something that is not your own
         (as using another's land as a right of way to your own
         land)
    2: the act of reducing something unpleasant (as pain or
       annoyance); "he asked the nurse for relief from the constant
       pain" [syn: easing, easement, alleviation, relief]