Languages cool as they expand: allometric scaling and the decreasing need for new words.

Sci Rep · 2012 · PMC3517984 · PMID 23230508

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a decreasing trendno p-value reported

We calculate the annual growth fluctuations of word use which has a decreasing trend as the corpus size increases, indicating a slowdown in linguistic evolution following language expansion.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.