1. brief explanatory text accompanying an illustration, photograph, or diagram
2. text displayed on screen showing dialogue or narration in films, TV shows, or videos

1. to provide with a caption or captions

Examples

• The magazine editor wrote captions for all the photographs.
• She always turns on captions when watching foreign films.
• The museum captions helped visitors understand the artwork.
• Closed captions make television accessible to deaf viewers.
• The photographer captions each image in her portfolio.
• Social media posts often include captions to explain the photos.
• The textbook captions clearly described each diagram.