buscaTermoNoWikipedia.js

function searchForTermOnWikipedia(term) {
  // example: https://en.wikipedia.org/w/api.php?action=opensearch&search=zyz&limit=1&namespace=0&format=jsonfm
  var action = 'action=opensearch';
  var search = 'search=' + term;
  var format = 'json';

  var params = '?' + action + '&' + search + '&' + format + '&callback=?';
  var url = WIKIPEDIA_API_URL + params;

  $.getJSON(url, function(data) {
    // faz algo com o resultado...
  });
}