When you've changed something for the better, like by rewriting your English essay to take out all of the spelling errors, you've amended it.
Amended is a word that means something has been modified or revised for the better. When you've amended something –- like a piece of writing or a poor opinion — you've fixed or mended it in some way. The word amended is often heard in the context of changes made to the United States Constitution, called amendments. The constitution has been amended to include the right for women to vote or the right of free speech.