Copy sentences from a website (website should be specified in @match). just select the sentence and its copied.

Sentence_Copy_On_Select.js

// ==UserScript==
// @name         Dictionary.com Copy Sentences
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        http://www.dictionary.com/*
// @grant    GM_setClipboard
// ==/UserScript==


(function() {
    if(!window.Kolich){
  Kolich = {};
}

Kolich.Selector = {};
Kolich.Selector.getSelected = function(){
  var t = '';
  if(window.getSelection){
    t = window.getSelection();
  }
    else if(document.getSelection){
    t = document.getSelection();
  }
    else if(document.selection){
    t = document.selection.createRange().text;
  }
    
  return t; 
    
};

Kolich.Selector.mouseup = function(){
  var st = Kolich.Selector.getSelected();
  if(st!=''){
    console.log(String(st));
    GM_setClipboard (String(st));
  }
    
};

$(document).ready(function(){
  $(document).bind("mouseup", Kolich.Selector.mouseup);
});
})();