omission

Etymology

From Middle English omissioun, from Old French omission, from Late Latin omissio, omissionem, from Latin omitto.

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.