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fortition
This term is a specialized linguistic descriptor used almost exclusively within phonetics and phonology. It describes a specific direction of sound change where a consonant becomes "stronger," typically characterized by increased muscular tension, greater airflow restriction, or a shift from a lenis (weak) to a fortis (strong) articulation.
Because it is a technical term of art, it is rarely encountered outside of academic papers or linguistic textbooks. It stands in direct opposition to lenition, which refers to the weakening of sounds. In a professional context, using this word signals a high level of formal linguistic precision.