Definition of "omission" in English

noun

1. (uncountable) The act of omitting.

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. Something not done or neglected.

   • The lack of a sponge count was an omission by the surgical team.

5. (grammar) 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.