: to furnish with a caption//… confirm that photographs are correctly captioned and pages numbered sequentially. — Publishers Weekly//… the captions and pictures are frequently out of sync, and the live local weather and sports segments are usually not captioned. — Melvia M. and Ronald E. Nomeland
probably short for certificate of caption (taking, seizure)
caption
noun
Synonyms (Entry 1 of 2)
1 an explanation or description accompanying a pictorial illustration //for the school yearbook, funny captions were written for snapshots showing a typical day at school
2 a word or series of words often in larger letters placed at the beginning of a passage or at the top of a page in order to introduce or categorize //the textbook features cleverly worded captions to capture the reader's attention