The Collaborative International Dictionary of English v.0.48:
Abetment \A*bet"ment\ (-ment), n. The act of abetting; as, an abetment of treason, crime, etc. [1913 Webster]WordNet (r) 3.0 (2006):
abetment n 1: the verbal act of urging on [syn: abetment, abettal, instigation]