Simply copy a word to the clipboard & easycat will fetch all the definitions-citations and audio from memidex & show them to you (including Wikipedia-Oxford-Collins). Easycat automatically goes to sleep if you copy more than one word-and wakes up when you copy a single word only. This assumes that if you copy more than one word you do not going to want to look all of them up. Hint for easy copy method: double click a word to highlight-right click highlighted word and select copy – easycat does the rest.
What do you need to know about free software?