1. An empty space on a document where information is supposed to be written: Mr. Williams said, "Don't forget to write your signature in the blank, Jim."
2. An segment of time that a person can't remember what happened: Tena said that her mind was a blank about what happened after she had fallen down the stairs.
3. A cartridge used in a gun that is filled with powder but which does not contain a bullet: The actors were firing blanks at each other during the production of the western film.

1. To hide or to cover something: The officials blanked out parts of the document before it was published for public viewing.
2. To completely cause something to be forgotten: The auto accident blanked out any recollection of what happened to her on that day.