Colour/ˈkʌlər/ Definition 1 of 5Pro Tip 1/3Visible Light Colours are perceived through light; without light, colours can't be seen. In the dark, all cats are the same colour. Pro Tip 2/3Cultural Meanings Colours often have cultural significance, with varying meanings across different societies. In some cultures, white is the colour of mourning. Pro Tip 3/3Emotional Associations Colours can evoke emotions; blue is often associated with calmness, red with passion. She felt serene in the room with soft blue walls.