The Collaborative International Dictionary of English v.0.48:
Excusatory \Ex*cus"a*to*ry\, a. Making or containing excuse or apology; apologetical; as, an excusatory plea. [1913 Webster]WordNet (r) 3.0 (2006):
excusatory adj 1: offering or expressing apology; "an apologetic note"; "an apologetic manner" [syn: apologetic, excusatory] [ant: unapologetic]