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- Language (general): A type of communication system, commonly used in linguistics, computer science and other fields to refer to different systems, including 'natural language' in humans, programming languages run on computers, and so on. A wider definition of language - what counts as a language and what doesn't - is a difficult philosophical topic, deserving an article in its own right.
- What is language?: The definition of language - what counts as a language and what doesn't - is a difficult philosophical topic, deserving an article in its own right.
- Language acquisition: The study of how language comes to users of first and second languages.
- Natural language: A communication system based on sequences of acoustic, visual or tactile symbols that serve as units of meaning.
- Sign language: A system of language in which expressions are conveyed using body movements rather than the human voice.
- Spoken language: An example of language produced using some of the articulatory organs, e.g. the mouth, vocal folds or lungs, or intended for production by these organs; alternatively, the entire act of communicating verbally - what people mean or intend, the words they use, their accent, intonation and so on.
- Written language: The communication and representation of a language by means of a writing system.
- Artificial language: A language whose phonology, grammar, and/or vocabulary have been devised by an individual or group, instead of having naturally developed.
- Programming language: A formal language specification, and programs for translating the formal language to machine code.
- Communication: The set of interactive processes that create shared meaning.
- Grammar (linguistics): The structural rules that govern the composition of sentences, phrases, and words in any language; alternatively, the system of language itself, i.e. the principles common to all languages.
- Speech (phonetics): Linguistic communication that uses the human vocal apparatus to articulate sound patterns that represent units of language.