English to English

noun (n)

• defective articulation of the `l' phoneme or the phoneme `r' is pronounced as `l'(noun.state)

  source: wordnet30
• gibberish resembling the sounds of a baby(noun.communication)

  Synonym:
  babble, babbling
  

  source: wordnet30
• An imperfect enunciation of the letter r, in which it sounds like l.(noun)

  source: webster1913