The etymological root is Anglo-French lien, loyen bond, restraint, from Latin ligamen, from ligare to bind.
In the United States, the term lien generally refers to a wide range of encumbrances and would include other forms of mortgage or charge. In the USA, a lien characteristically refers to non-possessory security interests (see generally: Security interest—categories). [Wikipedia, accessed 2009-10-16]