Cluster/ˈklʌstər/ Definition 1 of 4Pro Tip 1/3Visual Imagery Use 'cluster' to describe things grouped in a way that forms a visual pattern. A cluster of wildflowers brightened the meadow. Pro Tip 2/3Close Proximity 'Cluster' implies the elements are not just grouped, but also close to each other. A noisy cluster of birds gathered at the feeder. Pro Tip 3/3Common Characteristics Elements in a cluster share common traits or purposes. The town center had a cluster of historical buildings.