The act of neglecting to perform an action one has an obligation to do.
An instance of those acts, or the thing left out thereby; something deleted or left out.
Something not done or neglected.
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.
Origin
From Middle English omissioun, from Old French omission, from Late Latin omissio, from Latin omitto.
Modern English dictionary
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