In linguistics, meaning is the content carried by the words or signs exchanged by people when communicating through language. Restated, the communication of meaning is the purpose and function of language. A communicated meaning will (more or less accurately) replicate between individuals either a direct perception or some sentient derivation thereof. Meanings may take many forms, such as evoking a certain idea, or denoting a certain real-world entity. Linguistic meaning is studied in philosophy and semiotics, and especially in philosophy of language, philosophy of mind, logic and communication theory. Fields like sociolinguistics tend to be more interested in non-linguistic meanings. Linguistics lends itself to the study of linguistic meaning in the fields of semantics (which studies conventional meanings and how they are assembled) and pragmatics (which studies in how language is used by individuals). Literary theory, critical theory, and some branches of psychoanalysis are also involved in the discussion of meaning. Legal scholars and practitioners have discussed the nature of meaning of statutes, precedents and contracts since Roman law. However, this division of labour is not absolute, and each field depends to some extent upon the others. Questions about how words and other symbols mean anything, and what it means that something is meaningful, are pivotal to an understanding of language. Since humans are in part characterised by their sophisticated ability to use language, it has also been seen as an essential subject to explore in order to understand human experience. In semiotics, the meaning of a sign is its place in a sign relation, in other words, the set of roles that it occupies within a given sign relation. This statement holds whether sign is taken to mean a sign type or a sign token. Defined in these global terms, the meaning of a sign is not in general analyzable with full exactness into completely localised terms, but aspects of its meaning can be given approximate analyses, and special cases of sign relations frequently admit of more local analyses. Two aspects of meaning that may be given approximate analyses are the connotative relation and the denotative relation. The connotative relation is the relation between signs and their interpretant signs. The denotative relation is the relation between signs and objects. An arbitrary association exists between the signified and the signifier.