|Roles, philosophy: the expression role is usually used with an addition such as causal role, functional role, etc. It is signaled that a certain openness is required for a yet outstanding specification for a function within a system. In other words, there is a lack of knowledge concerning the object that performs the function. Linguistically, this is expressed by formulations like "Whatever plays the… role". An example from the philosophy of mind is the causal role of pain. See also functionalism._____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.