athetesis
/æθɪˈtɛsɪs/Definitions
1. noun
The suppression or rejection of a particular letter or letters in words.
“The spelling reform introduced athetesis, dropping the silent letters in many words.”
2. noun
The omission of a letter or letters in a word, especially in writing or printing.
“The typesetter’s error resulted in athetesis, changing the word’s meaning.”