1. To add extra information to something as a supplement, especially to a document: In addition to the important letter she was going to send, she appended a note to it explaining the delay.
2. To add an authorized signature to a bill, or an official agreement, as a final part of the ratification or agreement process: The lawyer asked the elderly lady to append her handwritten name to the will.
3. To attach, or to fasten, a thing to something else: Jane tried to append the jewel to her necklace.
4. Etymology: "to hang on; to attach, as a pendant", from Latin appendere "to cause to hang (from something), to weigh"; from ad-, "to" + pendere, "to hang".