Expanse/ɪkˈspæns/ Definition 1 of 2Pro Tip 1/3Magnitude Implication Implies an overwhelmingly large area, visually or metaphorically. The photo captured the endless expanse of the starry night sky. Pro Tip 2/3Visual Impact Highlights the visual awe one might feel when observing large areas. From the mountain top, the expanse of the valley took my breath away. Pro Tip 3/3Openness Emphasis Used when emphasizing the lack of obstacles or boundaries in a vast area. The open expanse of the plains allowed for an unobstructed view.