[{"Bold_text": "noun", "List Items": ["anything that serves to indicate, warn, direct, command, or the like, such as a light, a gesture, an act, etc.:a signal to leave.a traffic signal;a signal to leave.Synonyms: sign", "anything agreed upon or understood as the occasion for concerted action.", "an act, event, or the like that causes or incites some action:The unjust execution was the signal for revolt.", "a token; indication.Synonyms: sign", "Electronics.an electrical quantity or effect, as current, voltage, or electromagnetic waves, that can be varied in such a way as to convey information.", "Cards.a play that reveals to one's partner a wish that they continue or discontinue the suit led."]}, {"Bold_text": "adjective", "List Items": ["serving as a token or indication; used in communiating an intention, warning, or command:a signal flag.", "unusual; notable; outstanding:a signal exploit.Synonyms: striking , remarkable , exceptional , unique"]}, {"Bold_text": "verb (used with object)", "List Items": ["to make a token or indication to.", "to communicate or make known by a token or indication."]}, {"Bold_text": "verb (used without object)", "List Items": ["to make communication by something that serves to indicate, warn, direct, command, or the like."]}]