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Language learnable from a lexicon? (7)

Ross

I believe the answer is:

diction

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'language' is the definition.
(thesaurus)

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(Other definitions for diction that I've seen before include "Style of enunciation" , "Choice of words" , "Manner of enunciation" , "Way of speaking or pronouncing" , "words for speech" .)

I've seen this clue in the Evening Standard.
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