Palatalization (sound change)
Palatalization ( PAL-ə-təl-eye-ZAY-shən) is a historical-linguistic sound change that results in a palatalized articulation of a consonant or, in certain cases, a front vowel. Palatalization involves change in the place or manner of articulation of consonants, or the fronting or raising of vowels.
Source: Wikipedia — Palatalization (sound change) (CC BY-SA 4.0)