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Definition: undo


To restore the last editing operation that has taken place. For example, if a segment of text has been deleted or changed, performing an undo will restore the original text. Programs may have several levels of undo, including being able to reconstruct the original data for all edits performed in the current session. See redo and undo send.

Control-Z
On many operating systems and applications, pressing Ctrl-Z on the keyboard undoes the last function. See Control key.