easement

n. easing, lessening; relief from pain; legal right to use the land of another person for a specific necessary purpose (Law); convenience, item that makes a task or situation easier

An easement is the right to do something or the right to prevent something over the real property of another. At common law, an easement came to be treated as a property right in itself and is still treated as a kind of property by most jurisdictions. In some jurisdictions, another term for easement is equitable servitude, although easements do not have their origin in equity.
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Noun
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)
(hypernym) prerogative, privilege, perquisite, exclusive right
(hyponym) public easement
(classification) law, jurisprudence
2. the act of reducing something unpleasant (as pain or annoyance); "he asked the nurse for relief from the constant pain"
(synonym) easing, alleviation, relief
(hypernym) decrease, diminution, reduction, step-down
(hyponym) spasmolysis
(derivation) still, allay, relieve, ease

(n.)
That which gives ease, relief, or assistance; convenience; accommodation.
  

(n.)
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.
  

(n.)
A curved member instead of an abrupt change of direction, as in a baseboard, hand rail, etc.
  

A right of passage over a neighbor’s land or waterway. - (read more on Easement)