LINK / CITE ADD TO WORD LIST. noun. The definition of caste is a system of hierarchical social classes, or a specific social class of people. 1  When you are of a high social status, this is an example of your caste. 2  The Brahmins are an example of a caste in the Hindu culture.. The social position or status conferred by a system based on castes: lose caste by doing work beneath one's station. 1  A specialized level in a colony of social insects, such as ants, in which the members, such as workers or soldiers, carry out a specific function.