Variation in a person’s use of language depending on their communicative context (task, role, topic, audience etc.) and the language use of the individual or group with whom the person is communicating. Types of variation might include (in)formality of expression, choice of vocabulary and degree of explicitness. Also, a speech variety used by a particular group of people, usually sharing the same job (lawyers or doctors for example) or hobby (train enthusiasts or football supporters for example). Types of variation might include choice of vocabulary and different grammatical constructions (in legal language, for example).