I. ˈsəb-ˌtī-t ə l noun
Date: 1825
1. : a secondary or explanatory title
2. : a printed statement or fragment of dialogue appearing on the screen between the scenes of a silent motion picture or appearing as a translation at the bottom of the screen during the scenes of a motion picture or television show in a foreign language
II. transitive verb
Date: 1891
: to give a subtitle to