1 a : without any writing, marks, or pictures
a blank sheet of paper
Leave that line blank. [=don't write on that line]
a book with blank pages
a blank wall
b : having empty spaces to be filled in with information : not yet written in or filled out
a blank passport application/form
Sign your name on the blank line. [=a line that marks a place where you should write something]
2 : without any recorded sound or information
a blank tape/disk/CD
3 : not showing any emotion
She gave me a blank look [=did not show any emotion or response] when I asked her where she had been.
a blank expression/stare
4 always used before a noun : stated in a very direct and certain way
I was surprised by her blank refusal to loan me the money.
a blank [=(more commonly) flat] denial
1 : to suddenly stop showing letters, images, etc...
The screen on my computer went blank.
2 : If your mind goes blank, you are unable to remember or think of something.
My mind went blank when I heard the question.