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Fluency is the property of a person or of a system which delivers information quickly and with expertise.

It implies very good information processing speed, i.e. very little average time between successively generated messages.

Fluency is also proficiency in a language, most typically foreign language or another learned language. In this sense, "fluency" actually encompasses a number of related but separable skills:

To some extent, these skills can be separately acquired. Generally, the later in life a learner approaches the study of a foreign language, the harder it is to acquire auditory comprehension and fluent speaking skills. Reading and writing a foreign language are skills that can more easily be acquired after the primary language acquisition period of youth is over, however.

See also: