Wordnet 3.0
ADVERB (1)
1.
in an anterior direction;
The Collaborative International Dictionary of English v.0.48:
Anteriorly \An*te"ri*or*ly\, adv.
In an anterior manner; before.
[1913 Webster]
WordNet (r) 3.0 (2006):
anteriorly
adv 1: in an anterior direction