The Collaborative International Dictionary of English v.0.48:

Licit \Lic"it\ (l[i^]s"[i^]t), a. [L. licitus permitted, lawful,
   from licere: cf. F. licite. See License.]
   Lawful. "Licit establishments." --Carlyle. -- Lic"it*ly,
   adv. -- Lic"it*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

licitly
    adv 1: in a manner acceptable to common custom; "you cannot do
           this legitimately!" [syn: legitimately, lawfully,
           licitly] [ant: illegally, illegitimately,
           illicitly, lawlessly]