omission

noun omissions

1. uncountable The act of omitting. Scots was not ‘banned’ outright — impossible anyway with so many Scots-speaking teachers but, like Gaelic, marginalised by omission.

   Similar: preterition

2. uncountable The act of neglecting to perform an action one has an obligation to do. E&O insurance (for errors and omissions) covers both errors of commission and errors of omission.
3. countable An instance of those acts, or the thing left out thereby; something deleted or left out. The suspicious omissions in the new edition of the book attracted claims of censorship.
4. countable, uncountable Something not done or neglected. The lack of a sponge count was an omission by the surgical team.
5. countable, uncountable The shortening of a word or phrase, using an apostrophe ( ' ) to replace the missing letters, often used to approximate the sound of speech or a specific dialect.