Luminous/ˈluːmɪnəs/ Definition 1 of 3Pro Tip 1/3Visual Brightness Use 'luminous' to describe things that literally give off light or seem bright. The luminous stars guided our way. Pro Tip 2/3Highlight Importance Things described as 'luminous' can seem important or demand attention. Her luminous presence at the event couldn't be ignored. Pro Tip 3/3Metaphorical Use 'Luminous' can be used metaphorically to describe something that stands out for its brilliance. He wore a luminous smile that lit up the room.