caption
Concise Oxford English Dictionary © 2008 Oxford University Press:
caption/ˈkapʃn/
▶noun
- 1 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.
- 2 Law the heading of a legal document.
– origin 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’.
'caption' also found in these Oxford entries:

