Bible Dictionaries
Assibilation

Webster's Dictionary

(n.) Change of a non-sibilant letter to a sibilant, as of -tion to -shun, duke to ditch.

Bibliography Information
Webster, Noah. Entry for 'Assibilation'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/assibilation.html. 1828.