Adverbial fully has 3 senses
  1. fully, to the full, full - to the greatest degree or extent; completely or entirely; (`full' in this sense is used as a combining form); "fully grown"; "he didn't fully understand"; "knew full well"; "full-grown"; "full-fledged"
    Derived from adjective full3
  2. amply, fully - sufficiently; more than adequately; "the evidence amply (or fully) confirms our suspicions"; "they were fully (or amply) fed"
  3. in full, fully - referring to a quantity; "the amount was paid in full"