The action of excluding or leaving out someone or something; a failure to include or mention.
From Latin omissio, from omittere meaning 'to let go' or 'send away' (ob- 'away' + mittere 'to send'). The word entered English in the 14th century, maintaining its sense of leaving something out.
In literature and rhetoric, strategic omission can be more powerful than inclusion - what's left unsaid often carries more weight than what's explicitly stated. Legal documents particularly struggle with omissions, as what's not mentioned can create loopholes.
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