Ajax Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource

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JSONP or “JSON with padding” is a communication technique used in JavaScript programs running in web browsers to request data from a server in a different domain, something prohibited by typical web browsers because of the same-origin policy. JSONP takes advantage of the fact that browsers do not enforce the same-origin policy on script tags.
Note that for JSONP to work, a server must know how to reply with JSONP-formatted results. JSONP does not work with JSON-formatted results.

http://en.wikipedia.org/wiki/JSONP

Good answer on StackOverflow: jQuery AJAX cross domain

$.ajax({
  type: "GET",
  url: 'http://www.oxfordlearnersdictionaries.com/search/english/direct/',
  data:{q:idiom},
  async:true,
  dataType : 'jsonp',   //you may use jsonp for cross origin request
  crossDomain:true,
  success: function(data, status, xhr) {
    alert(xhr.getResponseHeader('Location'));
  }
});

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