This is the 9442nd most frequent Japanese word.
空白
"Blank" or "empty space."
Here, '空白' ('kuuhaku') refers to blank spaces or unused slots, such as in a timetable or schedule.
彼のスケジュールには空白が多いです。
There are many blank slots in his schedule.
In this case, '空白' indicates blank areas meant to be filled in, commonly seen in documents or forms.
このフォームには空白を記入してください。
Please fill in the blank spaces in this form.
Here, '空白' metaphorically signifies gaps or missing parts in someone's memory.