omission
nounUK /əˈmɪʃ.ən/
US /oʊˈmɪʃ.ən/
An omission is when something is left out or not done.
The omission of her name from the list was a mistake.
OTHER MEANINGS
2. The act of failing to do something that should be done.
His omission to lock the door let the dog escape.
3. Something that has been left out of a book or report.
The editor found several omissions in the final draft.
4. A failure to include someone or something.
The omission of dessert from the menu disappointed the kids.