Immensity/ɪˈmensəti/ Definition 1 of 2Pro Tip 1/3Expressive Impact Use 'immensity' to emphasize the overwhelming scale or impact of something. She could not grasp the immensity of the universe. Pro Tip 2/3Physical Spaces 'Immensity' often describes vast physical areas to highlight their extraordinary size. The immensity of the ancient forest was breathtaking. Pro Tip 3/3Abstract Concepts Can also refer to non-physical concepts to stress their significant scale or seriousness. The immensity of the crisis required immediate action.