Usage Note
Omettre is conjugated like mettre — irregular, with past participle omis. It is used in formal and written contexts more than everyday speech; informally, oublier or ne pas mentionner are more natural. Omettre de faire quelque chose ('to fail to do something') is a common construction implying negligence or deliberate omission.
Examples
"Il a omis de mentionner ce détail important."
Natural Translation
He omitted to mention this important detail.

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