LALLATION Meaning of LALLATION in English [ la'leɪʃ(ə)n ]■ noun imperfect speech, especially the pronunciation of r as l .OriginC17: from L. lallatio(n-) , from lallare 'sing a lullaby'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004