Focus on the pronunciation of vacuum
English definition of “vacuum”
/ˈvæk·jum/, /-ju·əm/, /-jəm/ n [C]
› physics a space without any gas or other matter in it, or a space from which most of the air or gas has been removed: Edison knew that he had to create a vacuum inside the lightbulb. fig. No marriage exists in a vacuum (= in a situation where nothing else has any influence).