n.
- a title or brief explanation appended to an illustration or cartoon.
▸a piece of text appearing on screen as part of a film or broadcast.
- Law the heading of a legal document.
v.
provide with a caption.
Etymology
ME (in the sense ‘seizing, capture’, later ‘warrant for arrest’ and so ‘statement of the authority issuing the warrant’): from L. captio(n-), from capere ‘take, seize’.