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Concept
Language proficiency
Summary
Language proficiency is the ability of an individual to use language with a level of accuracy which transfers meaning in production and comprehension.
Definition
There is no singular definition of language proficiency: while certain groups limit its scope to speaking ability, others extend it to cover both productive language and receptive language skills and their effective application in varying practical contexts. However, this diversity has implications for its application in other language domains such as literacy, testing, endangered languages, language impairment. There is little consistency as to how different organizations classify it. As of 2014, native-level fluency was estimated to require a lexicon between 20,000 and 40,000 words, but basic conversational fluency might require as few as 3,000 words.
Development
Developing proficiency in any language begins with word learning. By the time they are 12 months old, children learn their first words and by
Official source
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