| colour constancy | Unchanging perception of the colour of an object despite changes in lighting or viewing conditions. (05 Mar 2000) |
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| constancy | The quality of being constant. Origin: L. Constantia, fr. Consto, to stand still (05 Mar 2000) |
| constancy phenomenon | In perception, the tendency for brightness, colour, size, or shape to remain relatively perceptually constant despite real changes in colour, size, shape or other conditions of observation. (05 Mar 2000) |
| object constancy | The tendency for objects to be perceived as unchanging despite variations in the positions in and conditions under which the objects are observed; e.g., a book's shape is always perceived as a rectangle regardless of the visual angle from which it is viewed. (05 Mar 2000) |