What does overwrite mean?
Overwrite is a verb meaning to write over something already present, thereby replacing or concealing it. The word is especially common in computing, where saving a file under an existing name can overwrite earlier information and make it difficult or impossible to recover. It can also describe physically writing over text, a mark, or a surface, and, more figuratively, replacing an earlier instruction or version with a newer one. The prefix over- emphasizes that the new material takes precedence over what was there before. Although “overwrite” is often used when the replacement is accidental or unwanted, it can simply describe a deliberate replacement, as in a new edition overwriting a previous draft. Its clear association with replacement makes it useful when discussing editing, data storage, document control, and the consequences of losing earlier versions.
verbTo write over or replace something, especially text or data already present. In computing, it can also mean to replace stored information with new information.
- To write over or replace text or other material already present.
- To replace stored information with new information, especially in computing.
- To take precedence over or disregard an earlier instruction, rule, or version.
"Be careful not to overwrite the original document when you save your changes."
"The marker gradually overwrote the faded warning on the sign."
"The update overwrote the previous file without creating a backup."
Overwriting may erase the past in an instant, which is why a single saved file can replace months of careful work.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of overwrite
Overwrite is formed in English by combining the prefix over- with the verb write. The compound has been in use since the early modern period for the idea of writing over or upon something already marked. Its meaning in computing developed from the earlier literal sense, applying the same idea to replacing or superseding stored information. The related word rewrite uses the same transparent combination of over- and write to mean composing something again.
Related word forms
How overwrite is actually used
The word is common in both everyday and technical contexts. In computing, it usually implies that earlier data is replaced and may no longer be recoverable. The figurative sense, meaning to supersede an earlier decision or version, is less common.
Easily confused with overwrite
Overwrite means to replace or write over existing content, whereas overwhelm means to affect someone or something intensely or with a large amount.
Overwrite applies to replacing written or stored information, while overrule means to reject or override a decision or authority.