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1911 Encyclopedia Britannica
(Lat. captio, a taking or catching), a term still used in law, especially Scots, for arrest or apprehension. From the obsolete sense of a catching at any possible plea or objection comes the adjective "captious," i.e. sophistical or fault-finding. The term also has an old legal use, to signify the part of an indictment, &c., which shows where, when and by what authority it is taken, found or executed; so its opening or heading. From this is derived the modern sense of the heading of an article in a book or newspaper.
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Chisholm, Hugh, General Editor. Entry for 'Caption'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/c/caption.html. 1910.