adverb (r)

• without any others being included or involved(adv.all)

  Example:
  Did it solely for money.
  

  Synonym:
  alone, entirely, exclusively, only
  

  source: wordnet30
• Singly; alone; only; without another; as, to rest a cause solely one argument; to rely solelyn one's own strength.(adverb)

  source: webster1913