Plural of fluency; the quality of being able to speak, read, or write smoothly and easily without hesitation, often in reference to multiple languages or skills.
From Latin 'fluens' (flowing) combined with the suffix '-ency' (quality of). The word emerged in the 16th century to describe the smooth flow of speech and language.
Multilingual people often have different 'fluencies'—you might speak Japanese fluently but only read it at a beginner level, showing that fluency isn't all-or-nothing but comes in layers!
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