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A controlled vocabulary is a list of standardized subject headings used by catalogers and database indexers to describe what a source (e.g. an article or book) is about. These subject headings may also be referred to as subject terms, preferred terms, index terms, system keywords or descriptors.
Controlled language - a reduction in the number of words and difficulty of the sentence structure by restricting the grammar and vocabulary in order to reduce or eliminate ambiguity and complexity. Nowadays, it is used for machine translations, and by authors who plan to publish in more than one language.
The first controlled language was possibly developed by C.K. Ogden called Basic English in 1930 - he had the explicit goal of dramatically reducing the five-plus years it is estimated to take to master Standard English.1 Based on a vocabulary that contains 850 essential words (for comparison, the Oxford English Dictionary defines more than 600,000 words), Basic English is designed to be acquired in a few weeks only. (See Controlled Language article in Links & Files area.)
Natural Language the language of ordinary speaking and writing
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