Omission
Definition 1 of 3

Unexpected Surprise
Indicates an element missing from a list or group which was anticipated to be included.

Her omission from the guest list was unexpected.
Intentional Exclusion
Describes a purposeful choice to leave something out, often for clarity or brevity.

The recipe's omission of salt catered to those with dietary restrictions.
Compare with
exclusionfailurelapsemisdeedmistakeneglectnegligenceoversight
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