The word consonant means 'with a sonant' or vowel. Consonants are one of two main types of speech sounds, the other being vowels. In the production of consonants, the vocal tract is blocked, the vocal tract is seriously constricted, or the airflow is diverted through the nasal passage. The term articulation is used for the movements and adjustments required to produce an individual speech sound. Consonants are classified by (1) whether the vocal folds are vibrating, (2) where in the vocal tract articulation takes place, and (3) the manner of articulation (the type of articulation). Manners of articulation include plosives, nasals, fricatives, and approximants, the latter of which can be broken down into laterals and glides. Other manners of articulation include trills. Consonants may be produced with a secondary articulation in addition to the primary articulation.
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