home v Jennifer Su vacuum vac⋅u⋅um [vak-yoom] –noun 1. a space entirely devoid of matter. 2. an enclosed space from which matter, especially air, has been partially removed so that the matter or gas remaining in the space exerts less pressure than the atmosphere (opposed to plenum). 3. the state or degree of exhaustion in such an enclosed space. 4. a space not filled or occupied; emptiness; void: The loss left a vacuum in his heart. 5. a vacuum cleaner or sweeper. a b c d e f g h i j k l m n o p q r s t u v w x y z vacation vanishing-point vacuous vacuum view visitor violence void vomit vivid