What is the definition of “erasure” as used in this selection from the section "4. Erasure Poems"?

The redacted text is not blackened but erased, clipped out, or obscured beneath white-out, pencil, gouache paint, colored marker, sticky notes, or stamps.

Explanation:

An erasure poem is like a photo-negative of a blackout poem. The redacted text is not blackened but erased, clipped out, or obscured beneath white-out, pencil, gouache paint, colored marker, sticky notes, or stamps. Often the shading is translucent, leaving some words slightly visible.

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