Definitions for lallationlæˈleɪ ʃən
Random House Webster's College Dictionary
a speech defect in which l is pronounced instead of r, or in which an l-sound is mispronounced.
Origin of lallation:
1640–50; < L lallā(re) to sing lala or lullaby + -tion
defective articulation of the `l' phoneme or the phoneme `r' is pronounced as `l'
babble, babbling, lallation(noun)
gibberish resembling the sounds of a baby
the incorrect pronunciation of the letter "r" so that it sounds like an "l"
baby-talk or gibberish
an imperfect enunciation of the letter r, in which it sounds like l