1. an unintentional failure to notice or do something; a mistake caused by not paying attention
2. the action of overseeing something; supervision or watchful care

Examples

• The missing signature was just an oversight on my part.
• Due to an oversight, the meeting was scheduled for the wrong time.
• The committee provides oversight of the company’s financial practices.
• Congressional oversight ensures government agencies follow the law.
• The project failed due to lack of proper oversight.
• It was a simple oversight that caused the confusion.
• The board has oversight responsibility for all major decisions.