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no longer considered modern or current; obsolete
The software is out of date and needs to be updated.
The information in the book is out of date.
older than someone else in a group or relationship
He's out of date with the latest fashion trends.
Her views on politics are out of date.
Use 'out of date' to describe something that is no longer current or modern.
Use 'out of date' as a phrase, not as a single word.
The phrase 'out of date' originated in the late 19th century.
This phrase is commonly used in both formal and informal contexts.