adverb (r)

• using the voice; not silently(adv.all)

  Example:
  Please read the passage aloud.
  

  source: wordnet30
• with relatively high volume(adv.all)

  Example:
  Cried aloud for help.
  

  Synonym:
  loud, loudly
  Antonym:
  quietly, softly
  

  source: wordnet30
• With a loud voice, or great noise; loudly; audibly.(adverb)

  source: webster1913