B1
empty or clear, or containing no information or mark
Dictionary examples:
My mind went blank when the cute barista asked for my order. (0.0)
The teacher's face was blank when I said my dog ate my homework. (0.0)
The test paper was blank, just like my memory during the exam. (0.0)
a blank paper/page/form (22.9)
My computer's screen suddenly went blank. (27.4)
Sign your name in the blank space at the bottom of the form. (30.8)