
An employment authorization document (EAD, Form I-766), EAD card, known popularly as a `work permit`, is a document issued by United States Citizenship and Immigration Services (USCIS) that provides its holder a legal right to work in the US. It is similar to, but should not be confused with the green card. Certain `aliens` (non-residents) who...
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http://en.wikipedia.org/wiki/Employment_authorization_document

(or EAD) The card issued by the Citizenship and Immigration Services which permits a foreign national to work legally in the U.S. EADs are a benefit which accompany another status, such as a work visa, or a pending asylum or green card application, they cannot be applied for without some underlying immigration status.
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http://www.encyclo.co.uk/local/22155
(Ead) More commonly called a work permit, this is a photo identification card that certain nonimmigrants (foreign-born persons with a temporary right to be in the United States) may apply for in order to show employers evidence of their right or approval to work.
Found on
http://www.nolo.com/dictionary/employment-authorization-document-(ead)-term
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