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Related to phonological disorder: articulation disorder
a communication disorder of unknown cause, characterized by failure to use age- and dialect-appropriate sounds in speaking, with errors in the selection, production, or articulation of sounds. The most common errors are omissions, substitutions, and distortions of speech sounds.
A disorder in which the individual does not use speech sounds that are appropriate for age and dialect. The disorder may involve production, use, organization, or omission of sounds.