See also Abetter. The party who encourages or incites, entices or convinces another to commit a crime. One who aids, abets or instigates; one who advises, counsels, procures, or encourages another to commit a crime. An abettor who is present and encouraging or inciting is a principal in the second degree. If she is absent from the scene she is an accessory. Modernly called a principal in the second degree.