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Fortition


Fortition is a consonantal change from a 'weak' sound to a 'strong' one, the opposite of the more common lenition. For example, a fricative or an approximant may become a stop (i.e. [v] becomes [b] or [r] becomes [d]). Although not as typical of sound change as lenition, fortition may occur in prominent positions, such as at the beginning of a word or stressed syllable; as an effect of reducing markedness; or due to morphological leveling.

The extremely common approximant sound [j] is sometimes subject to fortition; since it is a semivowel, almost any change to the sound other than simple deletion would constitute fortition. It has changed into the voiced fricative [ʝ] in a number of indigenous languages of the Arctic, such as the Eskimo–Aleut languages and Ket, and also in some varieties of Spanish. Via a voiceless palatal approximant, it has turned in some Germanic languages into [ç], the voiceless equivalent of [ʝ] and also cross-linguistically rare though less so than [ʝ]. Another change turned [j] to an affricate [dʒ] during the development of the Romance languages.


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