Outer/ˈaʊtər/ Definition 1 of 4Pro Tip 1/3Physical Boundaries Use 'outer' to describe the furthest physical limit of objects or areas. The outer boundaries of the park were marked with fences. Pro Tip 2/3Visible Layers Refer to 'outer' when speaking about layers you can see, like clothing or coatings. He put on his outer glove before stepping into the snow. Pro Tip 3/3Initial Impression 'Outer' can imply a surface-level perception before knowing more details. Her outer calmness hid her inner anxiety.