Abridgment

[Britney]

The act of abridging, or the state of being abridged;
diminution; lessening; reduction or deprivation; as, an abridgment of
pleasures or of expenses.

[Michiko]

a book, play, or piece of writing that has been made shorter by removing some details or less important information:

[Lizzy Liz]

The action of abridging a text.