lenition

This term is a specialized linguistic descriptor used primarily in phonetics and historical linguistics. It describes a specific direction of sound change where a consonant's articulation becomes less obstructed, moving from a "hard" sound to a "soft" one. It is most frequently discussed in the context of Celtic languages, such as Irish and Welsh, where it often serves as a grammatical marker.

Because it is a technical term of art, it is rarely encountered in general conversation and is almost exclusively reserved for academic papers, textbooks, or linguistic analyses. It should not be confused with general "softening" of tone or mood in a social context, as it refers strictly to the physical production of speech sounds.