Definition of lallation in English:

lallation

Line breaks: lal|la¦tion
Pronunciation: /laˈleɪʃ(ə)n
 
/

noun

[mass noun]
1Imperfect speech, especially the repetition of meaningless sounds by babies.
1.1The pronunciation of r as l.

Origin

mid 17th century: from Latin lallatio(n-), from lallare 'sing a lullaby'.

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