The Collaborative International Dictionary of English v.0.48:
Legally \Le"gal*ly\, adv. In a legal manner. [1913 Webster]WordNet (r) 3.0 (2006):
legally adv 1: by law; conforming to the law; "we are lawfully wedded now" [syn: legally, lawfully, de jure] [ant: unlawfully] 2: in a legal manner; "he acted legally"