(1):

(n.) Act of abetting; aid.

(2):

(v. t.) To instigate or encourage by aid or countenance; - used in a bad sense of persons and acts; as, to abet an ill-doer; to abet one in his wicked courses; to abet vice; to abet an insurrection.

(3):

(v. t.) To support, uphold, or aid; to maintain; - in a good sense.

(4):

(v. t.) To contribute, as an assistant or instigator, to the commission of an offense.