Fortition

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Forition is a consonantal mutation in which a sound is changed from one considered 'weak' to one considered 'strong.' For example, a fricative or an approximant may become a plosive (i.e. /v/ becomes /b/ or /r/ becomes /d/). It is the opposite of lenition. Fortition is a much rarer sound change than lenition, and is not found in many languages.

[edit] See also

• Fortis and lenis
• Consonant mutation
• Grimm's Law
• Historical linguistics