The noun for that act of blacking out: going through an official document before publication and removing or covering the parts that must stay secret. It works two ways. As a general idea it is uncountable — 'the redaction of the files took three weeks'. But it is also countable, meaning one particular blacked-out piece: 'there were redactions on almost every page', 'a redaction covering three lines'. That countable use is common in news reports about leaked or released documents. Like the verb, it belongs to law, government and journalism rather than daily talk. It carries the same older scholarly meaning too: a redaction of a text is a version that someone has edited and put into final shape, and people who study ancient writings talk about the different redactions of a manuscript.

遮蔽、塗黑（機密內容）；也可指被塗黑的那一處。學術上另指文本的「編訂本、修訂版」。